There is a room in that building with a portal.
It can connect to the future.
Josh and Riley went through it in 1988.
Your only chance to save your children
is that glass building.
There are dangers there you will not be prepared for.
OK, here we go.
You don't have to be afraid of me.
I am your father.
Why is my mother in 1988?
Give me a chance to explain everything.
Why do I feel like you're playing a game?
Prove yourself to me. Let us use that portal.
Let's go get Josh.
- Josh! - Riley!
Every time that portal's been to a new time,
it creates a new sinkhole.
Another sinkhole's gonna open in the ocean
and cause a tidal wave.
But this one we might be able to stop.
So what's the plan?
Create a virus that will shut the Lazarus program down.
Stop the sinkholes and destroy the portal for good.
I have a brain tumor. It's terminal.
But I found a new purpose down here,
and I promise to fight.
Are you and Dad back together again?
I love your father, but I love Levi.
The only thing harder than you guys
splitting up the first time would be having
to live through that again.
If you don't come back to 10,000 BC with me,
we can't stop these sinkholes.
Looks like we're going with you.
Here we go.
Eve. Eve, wake up!
You all right? Did you see something?
As long as you're with me, I'm fine.
Let's go.
- Eve? - There you are.
Hey. - Hey.
Did you see the kids? - No.
We should head to the clearing. It's just up ahead.
OK.
There's no sign of them.
- They'll show up. - Yeah.
There's something you're not telling me.
What is it?
No, no.
I just want us to get to that building
before the tidal wave hits.
We will.
Hey.
There you are.
- Hey. - Mom.
Izzy.
Hey, where's Josh?
I don't know.
I thought he'd be with you two.
I'm sure he's gonna be here soon.
Ty.
I didn't know you were back. - Oh.
Well, we are neighbors now,
so I thought I'd come help out for the day.
Just in time too.
Looks like you guys finally got serious
about renovating the place.
Good thing I put myself through med school
working in construction.
I think we all realized we might be stuck here a while.
We want to get home,
but in the meantime, why not put down some roots?
Hey, you know, I've been thinking
about something like that too.
I asked Paara to marry me.
That's wonderful, Ty.
But in order to do that, I need a proper ring.
You want me to make one?
Well, I heard you're a great artist.
Do an old friend a favor?
I know just where to start.
Hey!
You busy? - No.
Ty has proposed to Paara and asked me to make him a ring.
I'm gonna head to this cave I saw
and try to find an amethyst.
Will you come?
Yeah, I'd love to.
Hey.
You love this thing.
I'm making a fresh start.
I don't know, Ella.
I'm as happy as I can ever remember being.
It's time I left all this stuff behind.
Does this have anything to do with Lucas?
We kissed.
And?
And it was nice.
Which is why I'm getting rid of everything
connected to the old me.
Connected to Aaron, you mean?
He gave me that bracelet.
He's had a hold on me long enough.
I get it.
It's just--
it's not as simple as throwing things out.
I just want to move forward
and never think about Aaron again.
Now let's find that cave.
Hey, someone please remind me not
to volunteer to help next time.
Keep pushing. It's nearly vertical.
We got this.
Sorry, what was your name again, mate?
Wyatt.
Wyatt, I appreciate your enthusiasm.
More muscle, less talking.
I can't hold it.
Whoa!
Damn it!
It's OK, it's OK.
Push it up.
There we go.
Hey, next time,
man, maybe it's better to do what you can handle
and not risk someone getting hurt.
Hey, how is your hand doing?
I can't feel anything.
Other than that, fantastic.
Hey, don't listen to Wyatt.
He has no idea what he's talking about.
Yeah?
Ten minutes ago, you told me he was a construction foreman.
I need a break.
Lucas.
Whoa, Ty.
You OK?
I'm fine.
It's just a headache.
Been getting them a bit more regularly
since that fight with Taamet.
Well, at least the best man won.
Honestly, it's bittersweet.
I still can't believe someone let him go.
So does Paara have any leads?
Yeah, they're out there searching for Taamet
and the traitor who freed him.
It's just a matter of time before they're caught.
And I imagine they'll be dealt with accordingly.
Yeah, yeah.
Totally. Punish them all.
Hey, look out!
Oh-ah!
You OK?
- Yeah. - I think so.
Damn, that was a big buffalo.
On second thought, maybe not.
What is it?
I'm not exactly sure what's happening in the sky,
but animals react badly to sudden changes in the weather.
Come with me.
Oh, man. - What?
- We're screwed. - Give them here.
There got to be hundreds of them.
Guys this is, like, really, really bad.
Why? They're miles away.
Yeah, for now.
But you see what's in the middle
of their migration path, right?
It's us.
The buffalo in that herd are exhibiting
some strange unfocused movements.
They're anxious.
If something else startles them, they're gonna run.
And they're gonna run through here.
One of those things knocked down
that beam like a toothpick.
Imagine what hundreds will do.
They'll destroy everything we've built.
Still no sign of Josh.
What are we gonna do?
We only have a few hours.
I hate to say this, but we need to head
for the building and upload the virus.
Yeah, I think she's right.
We made a plan to meet here.
Josh will make it eventually.
I'm sure he'll be OK.
I hate it.
I hate this, but I don't think we have a choice.
And Josh knows to keep quiet about what we're doing.
Even if we go without Josh,
I don't know if we should keep quiet.
Shouldn't we go down there first?
They deserve to know
we're about to trap them here forever.
Riley's right.
I mean, come on, those are our friends.
We've got to tell them what we've done sooner or later.
Might as well do it now.
No, that's just gonna start an argument.
It's better if we do it and just explain later.
So we're just gonna choose their fate for them?
We already have.
That's why we came back, isn't it?
OK, hey, we don't have time for this.
I agree. You see that haze?
That means an aurora is about to open.
It's also when the sinkhole in Santa Monica opens, right?
Exactly.
And if that happens, it'll create a tidal wave
that'll take out far more people than in your clearing.
To stop it, we need to go now.
Come on.
This is where we need to part ways.
- We're splitting up? - We have to.
James won't let Caroline in the building,
let alone near the machine.
But I can access the building's computer system
from a research station about 4 miles that way.
All right, Riley and I will go with you
in case there's trouble.
Yeah, and we'll go to the building with you, Dad.
Izz, I don't think--
Look, I know you think you can trust your father,
but he is dangerous.
She's right.
We said we were all in this together.
That's not a good idea.
I know James.
The only person he'll want to see is his son.
He may see Izzy as an extension of his legacy--
But not me.
I'll make him suspicious.
I don't like this.
I don't like it either,
but I'm not gonna be the reason we fail.
We'll be OK.
Let's sync our watches to 12:00.
In three hours, we act.
Once you get past the security lock,
I'll upload the virus.
The upload needs to reach at least 85%
to close that sinkhole.
But to shut the machine down for good,
it needs to upload completely.
All right.
Hey.
Be careful.
Seriously?
A stampede of prehistoric buffaloes?
Well, animal migration was one of my areas of study,
so I can say with some certainty
that we are totally screwed.
Well, I've got a plan.
It's called, let's get the hell out of here.
And go where?
I can think of dozens of safer places--
the caves, the beach, the hills,
those mountains to the south, that forest to the east,
literally, anywhere other than here.
- He's got a point. - No.
What do you mean, no?
We're not running.
We've been doing that since we got here.
Nothing's gonna take that away from us.
I agree.
And how do you propose to defend this place
against a wall of flesh and hooves
running at 40 miles per hour, huh?
Well, we don't fight it, Judah.
We divert it.
Man, I think that taser fried your brain.
Oh, no, no, wait.
Actually, I think diverting the buffalo could work.
Thank you.
Herd animals are easily guided.
All we need is some kind of barrier.
Right, right.
We pour the tar out around the edge of the clearing.
We light that, boom, wall of flame.
Scares the buffalo, redirects them around us.
- Nice. - Thank you.
OK, if we get a bucket brigade going,
we can lay that tar in no time.
- All right, count me in. - Come on.
Everyone grab one. - Don't say I didn't warn you.
So I need to get to the portal room.
But last time, James didn't let me out of his sight.
You want me to pull the fire alarm or something?
I got a better idea.
The infirmary is on the same level as the portal room, so...
I was thinking--
Are you serious?
Hey, it's got to be convincing.
So you and Mom kissed.
- Excuse me? - When you two said goodbye.
Yeah.
Are you guys back together?
I hope so.
Well, why'd you say it like that?
No, it's, you know, I got a lot on my mind, so--
Dad, we promised that we would watch each other's back
when we came down here.
You can't keep things from me. - I'm not.
The last time our family wasn't on the same page,
we pretty much broke apart.
I thought, once we got back together,
things would be different.
I guess I was wrong.
I had a vision.
In '88, before we went through the sinkhole.
I knew something happened, but I thought those stopped.
Yeah, so did I.
And it was of your mom.
And she was in my arms and surrounded
by all these red star-shaped flowers.
I think she was dead.
What?
Hey, look--hey, hey.
Just because I saw it, doesn't mean it has to happen.
Do you know where it happens?
When does it happen?
Dad? - Look.
Hey, look, until I can figure out what it means,
all we can do is just focus on this, OK?
OK? - OK.
Hey!
- We got company. - Hey, you!
Whoa, hey, hey, hey, hey, hey, hey, hey.
We don't mean any harm.
This is James' granddaughter.
I'm his son.
I need you to tell James that I'm back,
and I need to talk to him.
Gavin, it's good to see you.
I hope you found your son.
I did, yeah.
You remember Izzy, your granddaughter?
- Hey. - Hey to you too.
I'm glad you found what you wanted,
but I'm surprised.
Why come back?
Look, I know I had my doubts about you,
but getting my family back, it made me realize I--
there's so much I don't know about who I am,
where I'm from.
I want to know everything there is to know about my family,
and I want Izzy to learn all about it too.
Well, no one cares more about family than I do.
What happened to your arm?
When we came back down, the landing was hard
on all of us, so--
Well, we'll get you patched up in no time.
Take him to the infirmary.
Meanwhile, allow me to show you around the building.
After all, you're part of this legacy as well.
Right this way.
The research station's a mile due north.
We need to pick up the pace.
Hold up a second.
Before we get there, Riley and I have some questions.
What questions?
I've been running all this over in my mind,
and I just want to be completely sure.
The only way to stop these sinkholes
is to destroy James' machine?
Yes.
And once we do that, there's no way
of getting back to our own time?
We're just trapped here forever?
Guys, I think it might be too late
to be asking these questions.
Your whole family's down here,
so I understand this isn't your problem.
But once we do this, my daughter will never see
her mother or brother again.
So maybe indulge me a bit?
Yeah.
I just want to be clear.
This is our only option? - Yes.
And I'm sorry, but the only way back to your own time
is through James' machine,
and it's incredibly destructive.
We tried for years to make it safe,
but we failed.
It's just not stable.
Why can't it send us home, then we shut it down?
Because every time it's redirected to a different time,
a new and catastrophic sinkhole opens.
So you decide, Sam.
Which city do you want to destroy so you can go home?
Dad, Dad.
We don't have a choice.
Look, I understand what you're going through.
I sacrificed watching my own son grow up
for the sake of this mission.
But this, the virus I created,
is the only way to make things right.
All right.
I guess that answers my questions.
OK, let's keep going.
Fill it with tar, light it on fire,
and scare the buffalo away.
What did I miss?
Josh, you're back!
Oh, man, this could be the best day ever,
with the exception of the buffalo that are
about to destroy our home, but never mind that.
It is so good to see you.
It's good to see you too, man.
I missed you. - Hey, you doing all right?
Oh, yeah.
I twisted my ankle when I was walking to the clearing.
Sit, rest.
So where's everyone else?
What the hell happened up there?
They found us in '88.
We all jumped through together.
They should be right behind me.
We had to come back.
We couldn't abandon everyone down here.
OK, tell me you at least saw "Die Hard" on the big screen.
I wish, man, no.
It was pretty boring, honestly.
Whoa, whoa, whoa, boring?
What are you talking about? Are you insane?
I heard your grandmother was in '88.
Did you meet her?
Did she tell you anything about that crazy building?
It's a long story.
Hey, Josh, you can talk to me.
We're bros, remember?
Whoa, hold up.
OK, I think we got an issue.
No, no. Stay off the ankle.
I'll be back.
I'm telling you, man. Look, the width is good, right?
The camber, its perfect.
Camber?
You literally have no idea what you're talking about.
Man, I do this for a living. - All right.
Let's talk to the guy in charge.
Hey, man. Look, I think we're good here.
Yeah, we can just extend the fire line?
Bill the Builder here, he disagrees.
Yeah, I do.
Look, first, we need to widen the line.
We need more surface area to get the fire bigger.
Otherwise, I don't think your 40 mile an hour stampede
has any hope of being diverted.
- Lucas? - What?
Say something.
I don't know.
Listen to Wyatt.
Thank you.
Oh, hey.
You OK? - Yeah.
Then why did you hesitate just then?
Because I don't know a damn thing about tar or buffalo.
So?
A good leader motivates and delegates.
Scott, I don't want to be a leader.
OK. So why are you doing this then?
For Veronica?
OK, man, look, you don't have to be a tough guy around me.
All right, ever since Mom died,
I've been trying to change.
I'm trying to be better, right?
And you know what?
It doesn't happen overnight, but the way
that Veronica looks at me makes me believe
I can be the kind of guy who stands up,
defends his home.
Hey, Lucas, you are that person, OK?
And even though you can be a massive jerk sometimes,
you're still a jerk that I want to follow.
Don't doubt yourself.
Thank you, Scott.
You should start a podcast or something.
The amethyst for Ty's ring is just up ahead.
Wow.
It's beautiful, isn't it?
You think one of these will work?
Yeah.
I'm gonna check out the rest of the cave.
Oh, my God.
I know this tree.
Those flowers, I remember these.
They're the ones Aaron used to make you draw,
the ones you said grew in his old home.
So what are they doing here?
I can't be here.
Your father had the same expression
when I showed it to him.
It's really impressive.
So are you,
choosing to follow your parents down here
to an unknown future.
Oh, it must have been hard
giving up the modern comforts of the 1980s.
TVs and cars, they're cool,
but family is the only thing that matters.
I couldn't agree more.
I did have family here once, a son and a wife.
What happened to her?
She left.
In fact, from what I understand,
she traveled to the same time you were just in,
1988, Los Angeles.
I would have thought you'd crossed paths.
We didn't.
Huh.
Let's see how your father's doing.
Actually, can we get some food first?
Sure, we'll stop by our kitchen on the way.
Hey, James.
What's this tree?
Oh, that's our arbor caverna.
It's a fairly common tree here.
It only grows in this time period,
and strangely, mostly in caves.
We're studying it to figure out why.
Stunning, isn't it?
Well, let's see about that food.
Oh, my God.
Mom dies in 10,000 BC.
There's a stream up ahead.
Let's grab some water
before we make our last push to the station.
Be right there.
There's nothing there. Damn it.
Sam?
Everything all right?
It's all good.
Just looking for an extra water bottle.
- I was right about him. - You were.
He went straight for the drive.
What are we going to do?
We're not going to overreact. That's not going to help.
Let's just try talking to him.
Sam?
Riley?
Riley!
What the hell are they up to?
Veronica, are you OK?
Yeah, let's head back.
Listen.
I think we need to figure out what those flowers mean.
It doesn't mean anything.
Aaron probably saw them in a book.
It was a coincidence. - I don't know.
I always figured the flowers were some weird image
from his mind, but maybe he knew about this place.
How? He had never been here before.
Maybe there's a bigger reason why we're here.
This doesn't make any sense.
How is it that even when he's not here,
he finds his way back into my head right when I'm happy,
right when I'm trying to move past him?
I understand, but we can't just ignore this.
Ella, that man took away everything we knew.
If you're looking for an explanation,
you're never going to find one.
All I can do is promise myself a fresh start,
and nothing is going to stop me from doing that.
OK.
I won't bring up the flowers again, I promise.
Dad, stop.
Dad, what are you doing?
We need to get to the research station
before Eve and Caroline do. - Wait, wait!
What are you going to do there?
You want to stop the virus from uploading.
I can't let them destroy that machine.
We can't give up our only way back to Mom and Andrew.
But you can't do this.
I spent my life making hard choices
no one else wants to make.
If you don't want to be a part of it, I get it,
but I'm doing this.
Just a little sting.
State-of-the-art antibiotics.
It'll kill any infection you got here or in 1988.
So what do you do here?
I came onto Lazarus as a physicist.
Then your father put me in charge
of our classified research.
Eventually, made me his chief of operations.
Ah, he must have seen something in you.
He gave me a chance when no one else would.
So now I give him my loyalty and protect him from anyone
who might be a distraction.
Why does that sound like a threat?
Mastering time travel presents
a plethora of problems.
Your father is on the verge of solving them,
but he can't do that if people pull his focus away
from where it needs to be.
Ah. You mean people like me.
I don't care if you're family or not.
If anyone tries to upset his work,
it's my job to deal with them.
Good to know he's taken care of.
Just give me a moment, and then we'll
get you back to your father.
You know, if you have work to do,
I can find my way to my father myself.
It's all right. I'll take you.
I need you to authorize this, ma'am.
If I could have your signature there.
Hey!
Change of plans.
You're going to take me to the portal room.
Let's go.
OK.
I think we're nearly done.
A few more of these should do it.
Whoa.
Damn.
Jesus, that's the aurora.
Unbelievable.
Whoa.
Hey.
I was just on the watchtower.
That sound spooked the herd.
They're coming.
You ready, Lucas?
Yeah. OK, everybody, buckets down!
Stand back! Stand back!
Fire in the hole.
OK, everybody, clear out!
Go find some cover!
OK, they all need to go now.
Excuse me.
We have a situation on level five.
Everyone needs to go straight to their quarters
until further notice.
Take me to the access pad.
This is it, but it won't do you any good.
Only James can activate it.
We'll see.
It worked.
There it is.
Eve!
Riley, where is your dad?
I don't know.
It's like he snapped or something.
Well, what did he say?
He said he can't let you go through
with uploading the virus.
We need to work fast.
Let's hope Gavin made it.
He did it.
And now for the main event.
Time to upload the virus.
What's that?
Something's messing with the power.
Or someone.
- Come on! - Dad, Dad, Dad!
Dad, stop!
Stop! Sam, think about this.
Eve--
If you kill the power here,
people are going to die.
Everyone safe?
Yeah, there's not a soul left outside.
It's going to work.
Here we go.
Look, there's some buffalo from the head of the pack.
Come on, come on.
Come on.
Yes.
We did it.
Don't celebrate yet.
We still got a couple hundred more to go.
Usually, buffalo stay within about 100 yards
from the rest of the herd,
so I say we got a minute until they're all here.
No, no, no, no, no.
Was that a fish?
What the hell?
What is that?
Oh, my God.
What is going on?
Where is this coming from?
Oh, man.
It's salty.
Because it's coming from an ocean.
What?
In 1988, there's a sinkhole in the Santa Monica Bay
that's opening right now.
My parents and everyone else aren't here
because they're trying to stop it.
How?
By shutting off the portal.
But if they do that, how are we going
to get out of here this place?
I don't know.
We've got bigger problems right now.
The rain's putting out the fire.
Hear that?
The buffalo are coming.
What do we do now?
You can't do this.
I have to. I don't have a choice.
Dad, that aurora, it looks like it's closing,
which means the sinkhole's going to close.
The virus is working. There's no tidal wave.
Dad, you can't stop the upload now.
People are counting on us.
- I can't let you do it. - Eve--
Listen to me, Sam.
We all came back down here to save lives.
Thousands of people are at risk right now.
And I am so sorry it's coming at such a great cost to you,
I am, and I know how easy it is for me to talk
about sacrifice because I'm not making
as big a one as you are, but this isn't about me, Sam.
And it's not about you. This is about the greater good.
And I know how important that is to you.
What Caroline is trying to do right now is save lives.
You have to let her do that.
Sorry, I can't.
OK, Sam, if you're going to do this,
you have to go through me.
- Eve. - I'm not moving.
- Dad, Dad! - No, no.
Don't do this.
Dad.
Please.
Wait.
Rain's stopping.
The virus must be working.
Look, they're almost here.
Just listen to the hooves.
That's it.
Listening.
Vibrations.
Animals hate loud noises.
If we can't stop the stampede with fire,
maybe we can with sound.
OK, Ty, Ty.
Keep banging on that horn! Scott, you're with me!
- Hey, hey! - Honk your horns!
We need you to make noise, as loud as you can!
Everybody, honk your horns!
- Louder! - Honk your horns!
- Make some noise! - Honk your horns!
Honk your horns now!
As loud as you can!
Keep going, man!
Ahh!
It's working!
Keep going!
Whoo!
Yeah, come on!
It worked! - Yeah!
Yeah!
- Come on! - Hell, yeah.
- Whoo! - It worked.
Hey, you're back.
Hey, what happened here?
Oh, just a stampede of buffalo.
No big deal.
That's what that sound was?
Yeah, yeah, but we diverted them.
How?
Decided to make a stand.
You risked your life to save the clearing?
Why?
It's our home.
We did it.
Oh.
Ty?
Ty, Ty!
You're making a mistake.
No, I'm not.
Kiera, I got your alert.
He's uploading a virus.
James, stand back.
So you did find your mother?
I did.
Gavin, I promise, whatever she said to you,
it's not the truth.
And what you're saying is the truth?
I've been down here working on this machine
since the day she left.
I'm on the verge of stabilizing the portal.
That means safe time travel for everyone.
No more auroras.
No more sinkholes. - You're lying.
- He's not. - He is.
If you finish that upload, all my work will be lost.
We won't be able to rebuild this machine.
We'll be trapped down here forever.
I know.
What about Mom?
Dad, there's a tree here with the flowers
that you saw around her--
the red star-shaped flowers from your vision.
The trees, they only grow here in 10,000 BC.
Dad, this is where she dies.
Gavin, I can help you.
I can get her home, but I need my machine to be working.
You just have to put your hand on the pad.
It will stop the upload and save your wife.
What about the sinkhole in Santa Monica?
It's closed.
Whatever you were trying to stop
in 1988 has been stopped.
Every time you use the machine,
the sinkholes are going to keep happening.
I won't have that blood on my hands.
You won't if you work with me.
We're so close to a solution.
We can fix the machine and save your wife.
You just have to trust me.
I don't trust you.
Almost there.
Believe me, I can fix this.
I promise.
It's 98%.
I can save your wife's life.
Dad.