Name that Sci Fi Show!

It was on sometime between 1975 and 1985(?) on Saturday mornings; it was live action.

I think it had a Jason and the Argonauts in Space kind of feel - although maybe a bit more swashbucklery. Something with space pirates maybe? Almost like the movie Ice Pirates except geared more for kids.

I seem to recall a space ship - the good guys maybe, but more likely that of the bad guys - that was closer to a meteroite, with superstructures built into the rock.

Any ideas?