1960s(?) Sci-fi movie about a caped man called the 'Prince of the Universe'

Question

OK about 40+ years ago I remember seeing a movie on TV about a man who either referred to himself or was called the "Prince of the Universe" (no relation to highlander).

I don't have many details to give other than (if memory serves) he was dressed all in white (or possibly silver), with a cape, and I believe his suit also had some kind of antennae on its hood. The only scene I can remember was him fighting a bunch of bad guys in some kind of underground complex possibly caverns.

I'm reasonably sure it was filmed during the late sixties as it was in color. I know this isn't a bunch to go on but I figured I'd take a shot and ask.

Answer 1

This is Prince of Space from 1959.

Not in colour, but all the other features match. You may be getting confused because the box cover is in colour and/or because the film was featured on Mystery Science Theatre 3000 with interstitial segments (in colour, obviously) parodying the film.