|Episode(s)||7.20 The Girl with the Dungeons and Dragons Tattoo|
Tarrell is a Leviathan, who was tasked by Dick Roman to replace Pete and assume his identity at RRE, in order to keep an eye on Charlie Bradbury's progress hacking Frank Devereaux's hard drive. Later, as Charlie tries to escape from the building after erasing the info on the hard drive, Tarrell attempts to stop her. Bobby appears and throws him, breaking Charlie's arm by accident. Then, Dean and Sam burst in and toss some borax on Tarrell.