During her time on Veronica Mars, Bell appeared as Mary Lane in the film Reefer Madness: The Movie Musical, a reprise of the role she had played in the New York theatrical production of the musical on which the film was based. She also portrayed the lead role in Pulse, a remake of a J-Horror film. In 2007, she joined the cast of Heroes playing the character Elle Bishop, and Gossip Girl as the off-screen titular narrator. In 2008, she played the title character in the comedy movie Forgetting Sarah Marshall. She has since appeared in a number of comedy films, such as Fanboys, Couples Retreat, and When in Rome. Bell was also the voice of Cora in Astro Boy and is the voice and face of Lucy Stillman in the Assassin's Creed video game series. Bell has received a Satellite Award and Saturn Award, and has been nominated several times for Television Critics Association Awards and Teen Choice Awards.