There was a time in my younger days where I was absolutely obsessed with these guys. Made by Japanese toy maker Popy, these 8" figures were meant to fit in with Mego Superheroes (which Popy also supplied in Japan). That 8" Mark from "Battle of the Planets" is the toy we deserved as kids.
Speaking of Mego, tomorrow kicks off Mego Meet 10 in Wheeling, WV, I'll be there selling many different goodies. Please say hi if you make it.