In 1975, Mego produced a great Star Trek toy to stand alongside the bridge playset, the rare Mission to Gamma VI playset.
I must confess, however, that it always bugged me that the Gamma Creatures were out of scale with the Mego Star Trek action figures. It would have been a lot cooler if they had been of the same size, and not so cartoonish in design. They look kind of silly, frankly.
My second-hand Mission to Gamma VI set was missing the subterranean cave architecture and glove. So it was really just the Vaal-like mountain, the inhospitable landscape, the platform, and the mini-aliens.