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John Tesh

Star Trek: The Next Generation (tv program)
Famous for: Co-hosting "Entertainment Tonight." His character: A holographic Klingon in the "Star Trek: The Next Generation" episode "The Icarus Factor." According to the Star Trek Wiki -- where you can see a picture of John Tesh in Klingon garb -- he received no on-screen credit for his cameo... Kirk McKoy / Los Angeles Times