SUPERNATURAL Season 7 Episode 18 Party On Garth Sneak Peek : GARTH IS BACK TO HELP THE WINCHESTERS — Dean (Jensen Ackles) is surprised when he gets a call from Garth (guest star DJ Qualls) asking for the brothers’ help on a case. Sam (Jared Padalecki) and Dean discover they are battling a Shojo, a Japanese creature sent to seek revenge on enemies. The worst part about fighting a Shojo? You can only see it when you’re drunk. Phil Sgriccia directed the episode written by Adam Glass (#718).