The 27-year-old actress, who starred for three seasons as teenage detective Veronica Mars on the now-canceled show of the same name, will appear in a multi-episode arc on NBC's "Heroes" this fall.
"This was not easy to pull off. But since we're an ensemble show, with many arcs playing out through the year, we found a way to jump into a small window in her schedule," Tim Kring, the show's executive producer and creator, said in a statement Monday.
Kring said Bell's character, Elle, will appear in October and will be "a sexy, intriguing, mysterious young lady" who will commit a terrible crime, but it won't be clear whose side she is really on.
"Heroes" won't be the Detroit-area native's only TV work this fall.
She's providing the voice of the narrator (something she also did on "Veronica Mars") for the CW's new "Gossip Girl."
Bell also has some big-screen projects in the works, including a turn as the title character in "Forgetting Sarah Marshall," a comedy produced by Judd Apatow ("The 40 Year-Old Virgin," "Knocked Up").
By Mike Householder