Not that there's anything wrong with He-Man, but this musclebound hero came first and was created by the minds behind Howard the Duck and Scooby-Doo.
Red Dwarf's scouse technician Dave Lister was the last human alive, a down-on-his-luck slobbish space-hero long before Peter ...
John Prine used metaphor as well as any songwriter. His "Linda Goes To Mars" equates romantic struggles with space travel.