In GTA IV: The Lost and Damned, Johnny Klebitz leads The Lost MC, an outlaw motorcycle club operating in Liberty City and Alderney. Johnny serves as the club's vice president when the story begins, while Billy Grey is the official president.
The expansion follows Johnny's attempt to keep The Lost together while managing Billy's reckless decisions, drug problems, and desire for open conflict with the rival Angels of Death. The club's identity shapes the entire episode: missions emphasize motorcycle formations, clubhouse politics, territory disputes, weapons trafficking, and loyalty among its members. Johnny later becomes president after Billy's downfall.
Players sometimes shorten the name to “The Lost” or call the group “the Lost gang,” but “The Lost MC” is the distinctive canonical name used for the motorcycle club. The Angels of Death are a rival biker gang, not another name for Johnny's group. The story was released as downloadable content for Xbox 360 in February 2009 before later appearing on other platforms.