Czar-Doon was a Badoon. He was a member of Yondu's Ravagers at the time when Peter Quill was in the team.
After affiliating himself with Thanos, Czar-Doon landed with him in Nevada to verify Arthur Douglas' death.
Much later, Czar-Doon and his teammates of the Slaughter Squad stole the Black Vortex for Mister Knife, and had his cosmic potential unleashed by the artifact, but it seemingly worn out at some point.
After this series of events, Czar-Doon rejoined Yondu's Ravagers.
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