S2, E12: Walter and Margaret Brocken ask Samantha to keep their son Merle, a ten year old warlock, while they attend a witches con-vention. When Merle agrees not to do any magic before Darrin, Samantha invites him to stay. Meanwhile, Larry Tate asks Darrin to keep an expensive necklace, a birthday present for. his wife, at the Stephens home. Darrin goes to Merle's room, where the young warlock has turned a hairbrush into a model fire engine, which flashes with electric shocks when Darrin touches it. Darrin shouts with pain until Merle turns off the current. Samantha is now forced to disclose that Merle is a warlock.