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DC Comics Presents #47 "From Eternia with Death!"
While trying to infiltrate Castle Grayskull, Skeletor inadvertently opens a dimensional rift that brings pre-Crisis Superman from Earth to Eternia.
In order to continue with his acquisition of Castle Grayskull uninterrupted, Skeletor casts a powerful spell over Superman and forces him to do battle with He-Man.
Superman manages to hold off He-Man long enough to break free of the spell Skeletor cast over him and the two heroes then turn on Skeletor. With Skeletor defeated, Superman is returned home to Earth through a space warp.
He-Man has the equivocal endurance, resistance to injury, and strength of a demigod and also has an indestructible Sword of Power that can project mystical energy and open inter-dimensional gateways.
He-Man has demonstrated the ability to turn silica into glass, compress carbon into diamonds, and hurl planet-sized objects into orbit.