Star Trek and Planet of The Apes Mego figures. It was Mattel's two-foot long Eagle Transporter playset from Space: 1999.
This thing was a monster and came with small action figures of Moonbase Alpha's John Koenig, Helena Russell and Victor Bergman in their bright orange space suits. There were also tiny accessories like little laser guns, helmets and other bits of exploratory equipment. The cockpit opened and could hold two figures, and the passenger compartment was large enough to reach in and move them around. There was even a hatch in the bottom with a working winch!
The nose section and red engine section were detachable and could even be joined together to make a small reconnaissance craft. It was, without a doubt, the coolest spaceship toy ever.
my Eagle (I wish!) - all that remains of the one I received all those decades ago is the main chassis and nothing else; all the other parts having been lost or destroyed through years of dangerous space missions to the alien planets of my backyard. Oh, the perils I used to subject that tiny crew of Alphans to!
Obviously, I got an awful lot of fun out of that thing, and if my fortunes ever turn around, I'd love to hunt down an intact one one day.
Of course, I later had the Eagle (and Hawk fighter) model kits, and they were cool, too, but once built, there really wasn't much you could do with the ships other than display them. That didn't actually stop me from playing with mine, though... which is why they no longer survive!