With Jim out to sabotage Trinity, will all of our scientists survive the test?

The countdown is on.

In this final episode ofManhattanseason 2, two of our main characters are on the run.

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Credit: Gregory E. Peters/WGN

He cant do it and tries to persuade his comrade to abandon the plan.

To see to it I do mine?

He heads to the test site to intercept Jim while military police hunt for him.

That part is unclear.

It was a pretty brutal takedown.

Its a game of cat and mouse with lots of cats and lots of mice.

He meets with Liza Winter (Olivia Williams) who is hoping to study the effects of fallout.

Helen turns up at Trinity.

(She stole Stans pass, which is why he couldnt find it and is not probably dead.

She makes peace with Charlie after their affair went badly.

In case you set the atmosphere on fire tonight and this is goodbye…

I dont blame you for choosing your family.

Buy a slicker, he says.

Charlie ends up calling his in-laws house to talk to his son and discovers the boy is not there.

Then the in-laws hang up on him.

Back at his home, Abby (Rachel Brosnahan) wont take his call either.

She is planning her own escape.

NEXT: I dont want to hurt anybody!

Jim holds him at gunpoint: I dont want to hurt anybody.

Then you picked the wrong line of work, Frank says.

He says hes not here to stop Jim but to help him.

Ive been trying to put this thing back in the box for over a year, he says.

But is Frank there to save Jim or save the test?

Suddenly, the morality of Franks physics studies got a lot more abstract.

I dont think he knows what hes fighting for anymore.

Jim reveals hes not leaving once their work is finished.

Itll be over in a thousandth of a second, he says.

Whoever it was who sent you on a suicide mission…

It was a homicide mission, Jim says.

Kill the whole brain trust.

Liza figures out that it must be Frank up in the tower.

This seems to have hit a target with Darrow, who is speechless.

We cannot let anyone believe a Soviet spy was responsible, Frank says.

They wont think its an accident, Jim says.

But Frank has another idea.

They have to think it was me, he says.

Frank seems to be continually surprised by the depths of darkness in his friends.

The phone rings in the tower.

She says everyone knows he sabotaged the tests.

Youre going to get yourself shot, she says.

He tells her to get into the next car she sees and get out of the blast radius.

Dont send up the cavalry, he says.

Ive made a lot of mistakes.

Im trying to unmake one tonight.

I dont know if youre still my wife, but Im still your husband.

And I love you.

NEXT: The countdown is back on…

Frank cuts the radio broadcast.

The countdown is back on: 32 minutes.

Jim holds the gun on him.

What are you really doing up here, Frank?

Somebody had to save the world from the guys who were trying to save the world, he says.

If the gadget doesnt kill you, the army will, Fritz says.

Thats what Jim said, he tells Fritz.

You were right, Jim.

I have too much to live for.

Inside a bunker, Jim confesses his crimes to Fritz, including the death of his best friends wife.

Overcome with grief, Fritz takes the gun and points it at Jim.

Frank stands behind him, eyes fixed on the horizon.

Then the bomb goes off.

The three men stand in awe, staring at this new sun.

Fritz raises the gun, but puts it to his own head and pulls the trigger.

Behind him, the glorious glow of the blast becomes a screaming hellfire.

How will Frank and Jim explain Fritzs death?

Will he be scapegoated as the spy?

What becomes of Darrow after Isaacs letter arrives?

How will Helen fare overseeing the deployment of the bomb?

What becomes of Abby and her child as she flees her husband?