In this two-part special Alex finds out, with the help of Tina (a guardian angel in training) that Rosie is actually an Angel of Darkness or fallen angel, and that she has been deceiving Justin all along. When Justin breaks his wand and crosses over to the dark side to become an Angel of Darkness, Gorog (leader of the dark angels) tries to destroy him as he's an outsider. Rosie and Alex are determined to save Justin and get him back from the dark side, as they believe at heart he's still a good wizard, but will he listen to them?