User blog comment:Shinnest/How did Jack Bauer appear in all seasons of this show?/@comment-1408288-20140116224747

That's a really weird question.

He is the main character of the show. The show is about Jack Bauer. That's why he appeared in every season.

They have made 24: Live Another Day, because of the fan popularity for Jack Bauer's final return on the show. It's too please the fans.

I hope this answers your question.