Samantha goes away for a 10,000-zap checkup and Serena takes over for her at home. All trouble ensues when she weasels her way into Darrin's life when he is trying to impress another seroius client. Samantha comes home to witness Serena acting up and straightens things out. All is well, until one of Tabitha's toys, a troll, comes to life and starts embarrassing Darrin in front of his prospective client!