Early guest-starring roles include: "Buffy the Vampire Slayer" (playing Janice Penshaw, the best friend of Dawn Summers), "Boston Public", "", and "Punk'd", where Ashton Kutcher and his crew members tricked her into losing someone else's dog. In 2007, Tamblyn starred in the CBS pilot "Babylon Fields," an apocalyptic comedic drama about the undead trying to resume their former lives. The CBS network excluded the show from its fall programming lineup, since it would have competed with the network's other undead-themed drama, "Moonlight".