Margi Kleinjan (portrayed by Wendy Benson) is a high school girl that was born on the same day (January 12, 1979) as Terri Roberts, when certain planetary alignments caused the cosmos to focus all its energy on them. Now, days before their mutual 18th birthday, the planetary alignment is granting them the ability of telekinesis, which they are using to kill classmates they don't like and blaming it all on satanic ritualists. By the end of the episode, midnight rolls around, removing the cosmic focus from Margi and Terri for an interval of 72 years. (TXF: "Syzygy")

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