Killraye was a warlord who lived in a palace on the planet Jupiter. After capturing Mars Mason, his palace was destroyed by earth ships and Killraye himself was kicked off Jupiter into space. However, Killraye managed to get to a comet inhabited by the Needle Men, who he commanded in a series of attacks against Earth, targeting Interplanetary Post Offices where Mars Mason might be working. After battling Mars Mason, Killrayes forces were decimated by the Saturn Men.