Alec Baldwin, 'The Departed' DiCaprio and Baldwin didn't share any screentime in "The Departed." DiCaprio played the undercover rookie trying to take down Irish mob boss Frank Costello (Jack Nicholson). Baldwin played Capt. Ellerby, the head of a special investigation unit also tasked with locking up Costello but who doesn't have any knowledge of the identities of the undercover agents.
Andrew Cooper / Warner Bros. Pictures