Rogen plays the title character, a masked vigilante who fights crime with his faithful sidekick, Kato.
On "The Early Show," Rogen discussed the new film, which he co-wrote and co-executive produced.
Rogen said he had to drop some pounds for the role.
"You're a new man now," co-anchor Chris Wragge remarked.
"I am," Rogen agreed. "I'm gaining a little bit of it back, though. I think it's your instinct when you lose weight to go buy tons of clothes, and now I don't fit into any of them."
However, the weight loss for the role, Rogen said, was easier than you'd think.
"Honestly, a studio, if they want you to lose weight, they make it really easy for you," he said. "I essentially got a robot to come exercise for me every day. I stepped into an exoskeleton, did it for me."
As for the movie, Wragge said everything is blown up.
"We like to destroy things," Rogen said. "We were told that if we built something, we can destroy it. And we built a lot of stuff. And, yeah, I mean, we wanted to really kind of return to movies without a lot of visual effects and to try to do a lot of practical stuff, so we tried to do that as much as possible."
Rogen did many of his own stunts.
He said, "You know, every time we tried to have a stunt man do it, they're so much more physically coordinated than I am that you could tell it wasn't me. I just moved so spastically in real life that we have a stunt man do it, and he's like, 'Yeah, he doesn't look spazzy enough.'"
Rogen, a lifelong comic book fan, said he wanted to "inject something new into the genre" with the movie.
"As a comic book fan, it's nice when other people kind of clue in to the things that you think are cool," he said. "We really just thought that to do one of these movies that really examined the relationship between like a hero and his sidekick, and really played it like an action comedy, could be a really, new, interesting way to do a movie like this."
For more with Rogen on why "It's hard not to be creepy" around his co-star Cameron Diaz, click on the video below.