Christmas has come and gone, but here's one last gift to hold you over until iZombie returns with new episode in 2016: According to Entertainment Weekly, Veronica Mars herself, Kristen Bell, will guest star in the new year. Unfortunately, you probably won't see her face. Bell will have a voice-over role in the episode "Fifty Shades of Grey Matter," which airs Tuesday, January 26. In the episode, Liv (Rose McIver) eats the brains of a librarian who's also a writer of erotic fiction (hence the episode title). How Bell's voice-over fits in is still unclear.