Read more about John Casey at: Wikipedia

Official Site: NBC

Col. John Casey (born Alexander Coburn) is portrayed by actor Adam Baldwin on the television show Chuck on NBC. Prior to the episode "Chuck Versus the Tic Tac," he was partnered with CIA agent Sarah Walker to protect Chuck Bartowski.

In episode 21 of season 2, "Chuck Versus the Colonel," Major Casey was promoted and subsequently addressed as "colonel." In episode 10 of season 3, "Chuck Versus the Tic Tac," Colonel Casey was dismissed, adopting his cover of an overaged retail electronics salesman as his life. He was reinstated in "Chuck Versus the Other Guy" as a condition of his turning over the Ring director whom he captured in Paris.

Only scattered information has been revealed about John Casey's past or his family. "Chuck Versus the Tic Tac" reveals that his real name is Alexander Coburn (Chuck had flashed on this name in a previous episode, but the face is redacted and Casey cautions him not to dig further) and that under the command of Col. James Keller, he faked his death and was given a new identity of John Casey. In a second-season episode, Casey was shown calling someone he referred to as his mother, but considering the situation and the fact that he referred to himself as "Johnny Boy," it seems he was speaking in code.

Even his age is unknown, though there are clues in his revealed career history. He was attempting assassinations in the 1980s, he left the Marines to become an agent in January 1989, he was 23 years old when he started training with his mentor, NSA instructor Ty Bennett, and it was 1994 at some point in his training with Bennett.

John Casey has not been a contender in any CBUB matches.