Michael Rosenbaum reveals which episode he’d like revisit.

“Reckoning,“Smallville’s milestone 100th episode, is probably the WB/CW drama’s most important episode.

It was a moment five seasons in the making.

Smallville

Everett Collection

Unfortunately, the happiness didn’t last long because Lana dies in a car crash shortly thereafter.

“He loves blood, and it was cold.

I spent a lot of time on the cold concrete onSmallville.

Smallville

Michael Courtney/WB TV

And I remember him just like [saying], ‘More blood!’

It was something that does stick in my mind.

That was an intense sequence.”

In Clark’s do-over, he decided not to tell Lana his secret.

“It was such an emotional episode.

“It’s sort of like Clark has this unraveling in a way.

All his wishes are fulfilled.

And then the worst thing that could possibly happen does, and he has to make this sacrifice.

Clark would spend the rest of the series blaming himself for his father’s death.

“It was heartbreaking.

And here I have this father who’s alive and is the worst father in the world.

And yet he loses the best father that anyone could have.

Welling added: “That was a big thing.

When he puts his hand on Clark, he would grab me hard.

It wasn’t just an acting thing.

He was like, ‘Look at me right now.

I’m going to talk to you.’

But it was very important.

And John didn’t want to go away.

He didn’t want his character to die, so all of that is in there.

Welling also shared how he made sense of Clark’s stoic demeanor during Jonathan’s dialogue-free funeral scene.

Because Clark easily could have just been bawling, and everybody’s like, ‘Clark, stand up.’

(Rosenbaum left at the end of season 7 when his contract was up.)

“I wish there was more finality,” said Rosenbaum.

“I wish there was more of a conclusion.

I wish that it was drawn out a little more.

And I really was just like, ‘Hey, guys, I’m done.’

I would’ve liked a little more closure in season seven.

I got that a little bit in season 10 on the series finale.

But yeah, I’d say that was it.”

Smallville: The Complete Serieswill be available on Blu-ray starting Oct. 19.