In 2006, Davidson went to work as a writer and voice actor for Robot Chicken. He also worked as a writer and voice actor for the Adult Swim show Saul of the Mole Men. He wrote three episodes of the series, and starred as the voice of Bertrum Burrows. In 2008, Davidson starred as Thomas Jefferson in the Adult Swim special Young Person's Guide to History. He also voiced characters on the TV show MAD as a series regular and one of the principal cast members.