TV 90s

On "Quantum Leap", what are the only things that can see and hear Sam and Al in their true forms?

More Questions from TV 90s
Which actress in 1999, at age 13, was given her own variety TV show?
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On the TV show "Buffy the Vampire Slayer", what was Rupert Giles' nickname when he was younger?
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Jerry, Elaine, George, and Kramer dominated 90s airwaves in what show?
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On "The Sentinel", what town in Peru does Jim point out as being near Chopec territory?
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In the TV show "Twin Peaks", which character did David Lynch play?
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What genre was the TV series "Tales from the Crypt"?
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On "Star Trek: The Next Generation", on what planet was Data created?
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What does Rimmer accuse Lister's parents of on "Red Dwarf"?
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