Ah, the 1970s. There were a lot of crazy and moronic things on television, but this one truly pushes the boundaries. Imagine: a Star Wars spoof on "The Donny & Marie Show" with Paul Lynde (as Grand Moff Tarkin), Donny & Marie, Kris Kristofferson, Redd Foxx, Darth Vader (voice of Thurl Ravenscroft a.k.a. Tony The Tiger), C3PO, R2D2, and Chewbacca. Yes, it's true, and just as neuron-exploding as you might imagine it. See a clip here.
Check out PaulLynde.info for more classic clips, including some from the infamous Halloween special. And thanks to BiPM for the tip.