Starcrash (1978)

David Hasselhoff, Marjoe Gortner, and Carolyn Munro star in this outer space ripoff of Star Wars.  Hasselhoff is Prince Simon who is stranded on a planet after a spaceship crash.  Gortner is Akton... well I'm still not sure if he's part robot or what's going on there as he can play with electricity in his hand.  Munro is Stella Star, a Han Solo type of character, who wears tiny little costumes no matter where she goes.  And Christopher Plummer.... wait, how did he end up in this mess?

Evil bad guy Count Zarth Arn plans to take over the universe while Munro and Akton try to stop him while looking for Simon, the lost son of the Emperor (Plummer).

There are robots, bouncing cavemen, special effects right out of Mystery Science Theater, an Emperor who can stop the flow of time, a bad guy who chews the scenery, a doomsday device, and lots of laughs.  While there are times that the film slows down, the next ridiculous thing will be along soon, such as Stella working in the mines wearing a bikini.  Yes, she's the only one in the mining prison colony who wears a bikini instead of a loose drab outfit.  Ridiculous!