Theodore "T-Bag" Bagwell is a fictional character from the American television series Prison Break. Played by Robert Knepper, he is part of the main group of characters in the series and is part of the Fox River Eight. After guest-starring in the series' second episode, "Allen", the actor became one of the regular cast members.

The second season of Prison Break, an American serial drama television series, commenced airing in the United States on August 21, 2006, on Mondays at 8:00 pm (EST) on Fox. Prison Break is produced by Adelstein-Parouse Productions, in association with Rat Entertainment, Original Film and 20th Century Fox Television. The season contains 22 episodes, and concluded on April 2, 2007. Series creator Paul Scheuring describes the second season as "The Fugitive times eight," and likens it to the "second half of The Great Escape."