The 100

Previously, on "The 100"...

Something's coming,

something unlike anything we've seen before.

The wave of radiation

will kill everything in its path.

We didn't treat her.

Her body's rejecting the radiation on its own.

There's only one variable that separates Luna from the others.

Nightblood.

I should be going to the island to make Nightblood.

If Jaha's right and Becca created

Nightblood there, they'll find

her records, and all they have to do

is reverse-engineer it from Luna,

and everyone lives.

If they can get it done

before the radiation gets here.

I guess we'd better finish the ship.

They told us that you have a Nightblood.

Nightblood helps metabolize radiation.

We're investigating ways to create it

for everyone so we can all survive.

Roan wants you alive. Come quietly.

That'll happen.

Skaikru made me murder my entire family.

We're bringing you home.

Your ship is shelter from Praimfaya,

so I intend to take it.

Computer, show me the radiation detection software

available for the drone fleet in VHDL.

God, Becca was good.

Nightblood was designed to help the human body

not reject the AI and protect it

against radiation emitted from the device.

That's why it saved Luna.

That's why it'll save us all

if we can figure out how she made these cells combine.

Looks like Becca was experimenting

with perfluorochemicals, oxygenators,

the building block of artificial blood.

I know what they are, Jackson,

but I'm not seeing that here.

Abby, what if we came all this way for nothing?

What if we can't figure it out?

We can do this, Jackson.

We know that Becca figured it out.

Luna's proof of that.

If it's not in the database,

we reverse-engineer it from Luna's blood.

I need a new sample. Where's Luna?

She's sleeping, and we should let her.

We've taken too much already.

Her body needs time...

We don't have time!

Wait. You're right. I'm sorry.

Help me rerun the molecular valence test

on sample 7.

Copy that.

Abby, listen to this.

According to the record, Becca first developed

what we know as Nightblood

for the Eligius Mining Company.

Mining?

Long duration space missions.

Criminals were put into hypersleep

and given Nightblood to protect against solar radiation.

Hmm. Nice of her to share that

with our ancestors on the Ark.

I don't understand.

The Nightblood protein chains are broken.

How did she get them to bind to the blood cells?

I thought you hated molecular biology.

Raven.

She's seizing.

- Ok. - Grab her neck.

Ok. Ok.

Ok. On her side, on her side.

I got it. I got it.

I have a reaper stick in my bag.

- Yeah. - Get it. Hurry.

Ok. Baby. Ok, honey.

- Hold her. - I got her.

Ok.

- Ohh... - You're ok.

All right. This is the last batch of moonshine.

Feels a little light.

Your hunters are slipping.

I can only dry what they bring me.

Hey, any word from Jaha? Did they find Bellamy's unit?

Yeah. They're back, and we forgot to tell you.

Hi.

How light were we?

Always so serious.

Better. Don't worry.

The earth will be more generous next time.

See you then.

Hey, wait. Uh...

did you charge the radio

that I gave you when you were here?

Yes, like you told me to.

Good.

Clarke!

Octavia?

She just stopped breathing.

Ok. Get her on the table now.

There's a stab wound in her belly.

She's soaked in blood.

Ok. First things first.

1, 2, 3, 4...

Who are you?

How did this happen to her?

Ilian kom Trishanakru.

1, 2...

I was on my way home from Polis when I found her.

Ok. Get her to medical now.

Getting her here saved her life. Thank you.

Hey, hey, hey, hey, shh, it's ok.

It's ok. You're ok.

Octavia, you've lost a lot of blood,

but you're home now.

I'm gonna help you.

Azgeda's coming.

What's she talking about?

I...

Azgeda is coming.

- Army... marching. - Octavia, hey, hey, hey, stay with me.

War is here.

Take her. Go.

Ok. 3, 2, 1.

Got her?

Start an I.V., blood and fluids,

and... and get a suture kit ready.

Hey, I have to do this, but get Kane on the radio.

Find out exactly what's going on.

On it.

Harper, hey, look at me.

Convene the guard.

Miller's dad is ranking officer.

If Azgeda's coming, we need to plan

our defense, ok?

I'll be there as soon as I can.

- Ok. - Niylah, I could use the help.

Ok. We station gunners along the wall.

That way, we can thin their numbers

before they get a chance to close the distance.

And when they get close?

Hydrazine.

We buried what was left in the engines when we landed.

It's being dug up right now.

We're gonna pour it into the trenches.

- Hey, how is she? - Strong.

Listen. All we have to do is spread it

in front of the outer wall.

Then when the army gets close...

- We light them up. - That's right.

You want to light a fire outside the ship

we just spent the last month getting ready?

That's not happening.

Any word from Kane?

No, but Jaha found the cargo truck

12 hours out, no sign of Bellamy or Stephens.

I have to speak to Roan.

Something happened,

some sort of misunderstanding.

Clarke, if he wanted to talk,

he wouldn't be coming with his army.

Right, but there's only one way

to get here from Polis.

- I'll ride out and meet him. - Are you...

no, absolutely not.

Actually, that might work.

Monty, what are you talking about?

The Ice Nation thinks they have the element of surprise,

but, thanks to Octavia, we do.

Pike showed us how valuable that can be.

You're citing Pike?

As awful as that sounds,

yes.

We need to talk.

Little late for that.

Ok. We got their attention.

(ON RADIO) Remember, no one fires unless fired upon.

The radiation's our enemy, not the Ice Nation.

Your move, Wanheda.

10 minutes. That's all I ask.

Wait. Where's she going?

What if it's a trap?

It is a trap. We're already in it.

(ON RADIO) Ok, shooters.

They're moving towards the cave. Let the king go.

Wait a second. Who's still targeting?

(ON RADIO) Damn it, what are you doing, Riley?

Your target is the army.

Clarke is negotiating with their king.

Stop targeting. Over. Riley, respond.

Negotiating with these people is a waste of time.

We have the high ground. We have the guns.

We should just take them out.

Negative. We stick to the plan.

You really think Ice Nation gives a damn