Former “Supergirl” star Helen Slater has signed on to appear on the CW’s reworking of the Superman saga. Slater will play the aunt of “Smallville’s” recently cast Supergirl (Laura Vandervoort).Slater will appear in the sixth episode of the upcoming season, two weeks after ex-Superman Dean Cain (“Lois & Clark: The New Adventures of Superman”) is scheduled to appear. Slater has recently done guest gigs on “Crossing Jordan,” “Grey’s Anatomy” and “The New Adventures of Old Christine.”
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