he second season of 90210, an American television series, premiered in the U.S. on September 8, 2009 and ended on May 18, 2010. The season picks up at the end of summer after the events of last season's dramatic prom party. Rob Estes, Shenae Grimes, Tristan Wilds, AnnaLynne McCord, Ryan Eggold, Jessica Stroup, Michael Steger, Jessica Lowndes, and Lori Loughlin all return as series regulars from season one, while Dustin Milligan was released from his contract for "creative reasons".
New executive producer Rebecca Sinclair said she felt the show needed a "complete overhaul". She hired new writing staff and had new sets built. She was also quoted as saying, "If Gossip Girl is about youth in New York, I want to [make 90210] about youth in L.A. and Beverly Hills." Sinclair also revealed that she wanted to rely less on cast members from the original Beverly Hills, 90210, though Jennie Garth and Ann Gillespie did return for a limited time.
The first episode was seen by 2.56 million viewers, the most watched episode of the show since January, 2009.Overview from themoviedb.org