The "Forgetting Sarah Marshall" cast features actors and actresses commonly seen in previous Judd Apatow films as they gather in this romantic comedy. While actress Kristen Bell portrays the title character in the "Forgetting Sarah Marshall" cast, the film revolves around Jason Segel, who plays Peter. The "Forgetting Sarah Marshall" cast also includes a number of familiar names in cameo roles such as Jonah Hill, William Baldwin, Jason Bateman and Jack McBrayer.

  1. Jason Segel as Peter Bretter - A frequent cast member in Judd Apatow works, Jason Segel plays the main character of Peter Bretter. In the film, Peter vacations in Hawaii in an attempt to get over a breakup with Sarah Marshall, but soon learns Sarah is visiting the same resort. Outside of the movie, Jason Segal has appeared in Apatow productions such as "Freaks and Geeks," "Undeclared" and "Knocked Up" as well as appears on the television series "How I Met Your Mother."

  2. Kristen Bell as Sarah Marshall - Portraying the title character of Sarah Marshall is blonde beauty Kristen Bell.  Sarah is an actress in the "Forgetting Sarah Marshall" cast who leaves Peter.  She later changes her mind after a failed relationship with a rocker and attempts to get Peter back.  After getting her start on the television show "Veronica Mars," Kristen Bell went on to appear in films such as "Couples Retreat" and "When in Rome."

  3. Mila Kunis as Rachel Jansen - Joining the "Forgetting Sarah Marshall" cast at the other woman, Mila Kunis portrays Rachel Jansen.  Rachel, the hotel concierge in Hawaii, builds a relationship with Peter, but when Sarah attempts to re-enter Peter's life, things get a bit ugly.  Prior to becoming a member of the "Forgetting Sarah Marshall" cast, Mila Kunis appeared on the television series "That '70s Show" and she went on to receive a Golden Globe nomination for her supporting role in the 2010 film "Black Swan."

  4. Russell Brand as Aldous Snow - As the other man in the love rectangle among the "Forgetting Sarah Marshall" cast of characters, rocker Aldous Snow is played by Russell Brand.  Aldous, who later appears in the film "Get Him to the Greek," hooks up with Sarah after her split with Peter.  However, just like Rachel, Aldous is thrown off when Sarah rekindles her romance with Peter.  Off the big screen, Russel Brand has lent his voice to animated films like "Despicable Me" and "Up" as well as made headlines in 2010 when he married pop singer Katy Perry.

  5. Paul Rudd as Chuck - Only appearing in a small role in the "Forgetting Sarah Marshall" cast Paul Rudd portrayed Chuck, a surf instructor in Hawaii.  The quirky surfer, also known by his Hawaiian name Kunu, meets Peter during his vacation and gives Peter a made-up Hawaiian name of his own.  Actor Paul Rudd is another who is often seen in Apatow productions having appeared in "Knocked Up," "The 40-Year-Old Virgin" and "Anchorman." 

-Angela Huetteman