[WestVirginiaRebel]

William Shatner, Leonard Nimoy, Nichelle Nichols, George Takei and Walter Koenig as themselves on Futurama

John Wayne on Maude where he walks in while she's ranting about his politics and renders her speechless.

Mel Torme on Night Court.

Tony Curtis as "Stony Curtis" on The Flintstones.

Oliver North on J.A.G.

Charles Nelson Reilly as science fiction writer Jose Chung on The X-Files.

Penn and Teller on Babylon Five.

The Tribbles and Captain Kirk on Star Trek: Deep Space Nine : )

[andysandmikesmom]

I loved Charles Nelson Reilly as Jose Chung on the X-Files...werent there two episodes with Reilly as Jose Chung...also in the first of those two Jose Chung episodes, Alex Trebeck of Jeopardy fame, made a cameo, I think as one of the 'Men in Black'...

[Hillarys Gate Cult]

Another Duke cameo was at the end of a "Beverly Hillbillies" episode.

[BluesDuke]

Classic Flintstones cameo: the Beau Brummels, the mid-1960s rockers, performing their great single "Laugh Laugh."

Not to mention the Standells, a few years before they became pre-punk garage-style hitmakers ("Dirty Water," "Riot in Cell Block #9," "Try It"), on The Munsters...