Fringe

So I'm going to show you

the next piece of the plan

to defeat the Observers.

Previously on Fringe...

- Donald... - Donald?

That was the name of the man that was waiting for Walter

21 years ago.

He's gone.

He was a part of the plan,

and without all of the parts, the plan is useless!

And you have no idea who Donald is.

- No. - We have to find him.

This radio was left for us in the pocket universe

but the tuning dial's been jammed.

It's, like, stuck on one frequency.

Why?

Nothing's being transmitted.

The man I was before--

he was consumed by ambition, by hubris,

and all he cared about was walking with the gods.

Everyone that I care about will be driven away.

It's the only way to hold on to the man I've become.

You must remove these pieces of my brain.

Walter?

Walter.

Hello, Astrid.

Walter, what are you doing out here?

Your hair...

it's beautiful.

Thanks.

Did you fix this radio?

Because it's picking up a signal.

It's beautiful.

You okay?

Yeah.

Yeah, I just can't sleep.

How are you feeling?

I had another one of those headaches.

Can I get you something?

No.

I got everything I need right here.

There's something you both need to see.

The radio's working.

The pattern's repeating on a loop.

It's like it's some kind of morse code,

but it's not morse code,

or at least it's not any morse code

that I've ever heard.

So do you think maybe it's Donald?

Why now?

How would he even know that we're still alive?

Well, he left the radio for Walter for a reason,

and he left it on that frequency for a reason.

Maybe he's trying to contact us.

Well, yeah, him or anybody else with a shortwave radio.

The only way to know for sure

is to find out what that message is.

Walter.

Walter?

Do you recognize this?

It's gonna be difficult

to get any information from him right now

because he dropped acid.

Walter.

Walter?

Walter?

Are you tripping?

Most definitely.

Walter...

I need to talk to you.

Can you concentrate for a moment?

Carla Warren is here.

My old dead lab assistant

is here to haunt me.

The one that was burned in the fire.

The radio is picking up a transmission.

We think it's from Donald.

Do you recognize it?

Okay, I ran prelims on the transmission

through my encryption program,

just trying to figure out if there's some sort of pattern

hidden in the beeps and tones,

but I can't make heads or tails of it.

Okay, Walter, if they're right

and Donald did send you a message,

it makes sense that he'd expect you to know it.

Right.

Makes sense.

Why send me a message I can't understand?

- So can you? - Hmm?

Understand it?

It's in "A" minor.

Peter, I'm sorry.

I didn't know we were going to get a message.

How could I know that?

I wouldn't have taken the acid if I had known that.

What kind of acid did you take?

Black blotter.

I found some hidden in the storeroom.

Why?

Because it was an excellent batch.

No, why did you drop acid?

I'm desperate to remember the plan

before he completely takes over.

Who are you talking about, Walter?

Nina and I made an arrangement.

What kind of arrangement?

She promised

that when I finished the plan to defeat the Observers,

she would help me remove the pieces of brain

that they put back in.

I don't think that's a good idea, Walter.

I don't want to lose you, Peter.

I don't want to lose any of you.

And you won't, Walter.

I'm right here.

We're all right here together.

It's not enough.

I'm afraid we're running out of time.

What do you mean, Walter?

Two nights ago, you were all asleep.

I found myself at the tunnel entrance door,

dressed and ready to go,

to go outside.

Out there.

Where was I going at 3:00 in the morning, Peter?

Where?

I don't know, Walter.

And neither do I!

But he does.

But he does.

He knows where I was going.

Who knows, Walter?

The Walter that was.

I don't even remember what I was doing.

It's like the first time I went out,

but I stopped myself.

But what if next time I didn't stop myself,

couldn't stop myself, what then?

I promised you, Peter, but he made me.

He almost made me.

For reasons I do not know.

I need to figure out this blasted plan

to defeat the Observers, and I have to do it quickly

to rid myself of this devil.

There must be something they left intact,

something I can use.

Peter. Peter.

Peter, I don't think I should be discussing this

in my condition.

You need to allow me to do my work.

I need to think,

to figure out the tones.

Okay, come on.

What if we don't have to crack the code?

What do you mean?

The signal's coming from somewhere.

If we track it,

maybe we can figure out what it means.

Peter, can we locate where this signal

is being broadcast from?

Well, I'll get in contact with Anil,

see if the Resistance has a receiver

that can help us triangulate the signal.

Thank you, my dear.

The tech works by isolating the frequency

of the radio signal you're looking for.

It locates the signal

by using three different vectors

to triangulate the signal.

And we have to be at a certain elevation

to track it?

No, the machine does it for you,

utilizing a satellite.

Hey, Walter.

We're about to find the signal's origin.

I know that.

Do you know that

there's something hidden in this lab?

Walter?

Walter?

What's wrong with him?

When did he get here?

Half an hour ago.

He brought the tech that's gonna help us

track the signal's location.

Let me set the parameters.

Set those red geolocate buttons to "accept."

Go back. I think that was it.

Have to go on foot from here,

but the transmission's definitely coming

from that direction.

Well, how far out?

Uh, it's hard to say,

but the signal's so strong.

I'm guessing not more than a couple hundred yards.

What?

You amaze me.

After everything I've put you through,

I did the very thing I promised you I wouldn't do,