Hot off the heels of the news that Rob Riggle is in talks to play a villain in the upcoming 21 Jump Street movie, Dave Franco has joined the cast as one of the villains as well. Deadline reports that Franco will star as Eric, “the most popular kid in school.” Eric is a drug dealer at the high school that the characters played by Jonah Hill and Channing Tatum infiltrate as undercover cops. Hill befriends Franco's character in order to get close to the "cool kid" crowd. I’m not exactly sure how Riggle fits into the equation villain-wise, but it makes sense to have a more significant bad guy in the film in addition to the “douche high school drug dealer.”Additionally, with production on the film fast approaching, serious plans are now being made for Johnny Depp to cameo in the film based on the TV show that launched his career. While it’s uncertain what role he would play, apparently producers are working on getting the actor on set to shoot a quick scene.  Directed by Phil Lord and Chris Miller, the film stars Hill, Tatum, Ice Cube and Brie Larson. 21 Jump Street hits theaters on March 16th, 2012.