TV 90s

Which 90s Cartoon Network show involved a young scientist and his sister Dee Dee?

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Who is an original "Law & Order" cast member?
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What was Chad Michael Murray's character's name on "Dawson's Creek"?
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On "ER", where did Chloe meet her new boyfriend when she returned for little Susie in the third season?
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Who killed Francescha on "Sunset Beach"?
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