Kiefer Sutherland in 24Kiefer Sutherland as Jack BauerIt looks like Jack Bauer might not be as invincible as we thought.

Show bosses have hinted that top US series, 24, could end after just one more series.

24 executive producer Howard Gordon told E! that he might very well "blow up the whole world" and Jack Bauer with it.

"My hope is to go after the eighth season," said Howard. "Keifer and I have talked about it, and I think that’s sort of what we’re aiming for."

But there's also talk about a big-screen version of 24, which would be released after the TV series ends.

"I think we came to the conclusion, and I think we’re in agreement with Fox, that the only way we’re going to do it is after the show’s over," explained Howard. "I don’t think a big-screen 24 works while Jack is on TV."

Makes sense, but would they really kill off the coolest man alive?

"We realize now that [Jack's] more a human being than we really thought," said executive producer Jon Cassar. "He's not the superman everyone thinks he is."

Even show star Kiefer Sutherland has warned fans not to expect a happy ending for Jack: "I see [Jack] as a really human figure, and I think there is something innately tragic about people.

"I think there is no winning. We're all going to die. There's something kind of sad in that, and yet there's something really beautiful and hopeful."

Hmm... a little too deep for our liking Kiefer, but we have to admit - going out in a blaze of glory would be a fitting end for Jack.

Find out when 24 is showing on TV.