Synopsis:
Agent Murphy seeks the help of the Charmed Ones when a vicious demon breaks free of government containment. The demon is spreading a virus that unleashes a Hulk-like rage in magical beings, which infects Billie. Piper and Leo look for a cure, but Paige and Phoebe must enter a Hulk-like state, themselves, if they want to keep Billie from dying. Meanwhile, Phoebe ruminates on the unfulfilled prophecy of a pregnancy, while Paige is forced to help Henry by taking care of a parolee's baby.
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