EXCLUSIVE: Colin Firth on Returning to 'Kingsman' After Character's Supposed Death

Colin Firth is spilling on exactly how his character, Harry Hart, survived Kingsman: The Secret Service -- kind of.

ET's Kevin Frazier caught up with the 56-year-old actor on the red carpet following the panel for Kingsman's sequel, The Golden Circle, at San Diego Comic-Con on Thursday, where the Oscar winner told us as much as he could about how his character was brought back from the dead.

EXCLUSIVE: Halle Berry Jokes About Bourbon-Chugging 'Kingsman' Comic-Con Panel: 'I Never Drink And Tell'

"It's very strange, because I flew 6,000 miles to promote this movie [at Comic-Con], and then am told to shut up," he joked. ""Don't give anything away!'"

"I'm glad the trailer came out this morning, because it means I can finally not pretend I'm just a visitor here," he added.

According to Firth, it was director Matthew Vaughn's decision to bring him back for round two, after "a lot of conversation early on."

"Matthew did want to hold on to me, to my relief, because I would have been heartbroken if I had to say goodbye," he said, adding that he hopes the Kingsmen are still "cooler" than the Statesmen (played by Jeff Bridges, Channing Tatum, Pedro Pascal and Halle Berry) introduced in the upcoming sequel.

EXCLUSIVE: Channing Tatum on Meeting 'Kingsman' Co-Star Halle Berry for the First Time: 'She Is So Beautiful'

"I thought it was a very cool idea, but I am getting increasingly annoyed seeing responses to these guys, so I think we will have to assert ourselves," he said, before noting that Berry in particular is "full of surprises" after her bourbon stunt.

"Out of all of us, she is probably the quiet one, and I suspect she requested that glass, and she made a bit of a show, saying, 'No, no.' But I think this may be cocktail hour for her, and this is how she wanted it," he cracked. "She stayed vertical for longer than we would have imagined."

"She can drink us all under the table," he added.

As for the other Statesmen, they can hold their own as well.

RELATED: Channing Tatum, Julianne Moore, Jeff Bridges & Halle Berry Look Amazing in New Rapid-Fire 'Kingsman 2' Teaser

"For the first month [of training], I felt a slight sense of humiliation because they are all champions at something, boxing or gymnastics or Kung Fu or something, and I am nothing," he explained. "I decided I would get points for showing up and just being keen."

Firth's fellow Kingsman, Taron Egerton, meanwhile, said he and the cast are "typically very, very professional" -- but he'd be down for a rematch of the fight he had with Tatum in the film.

"I''m still quite annoyed by the outcome of my fight with Channing," he confessed. "Yeah, I'd take Channing. I'd take Tatum any day of the week."

See the trailer for Kingsman: The Golden Circle in the video below.