Wizards of Waverly Place: Season 3, Episode 9
Wizards vs. Werewolves (22 Jan. 2010)
Alex learns Mason's secret, that he's a werewolf. Justin is about to give up on his quest to find Juliet. With Masons help, the young wizards find Juliet, but Justin thinks that Mason has captured and took Alex along with him; Justin must save Alex.