History
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Enhanced by the Black Vortex
Czar-Doon was a Badoon.[1] He was a member of Yondu's Ravagers at the time when Peter Quill was in the team.[2]
After affiliating himself with Thanos, Czar-Doon landed with him in Nevada to verify Arthur Douglas' death.[1]
Much later, Czar-Doon and his teammates of the Slaughter Squad stole the Black Vortex for Mister Knife,[3] and had his cosmic potential unleashed by the artifact,[4] but it seemingly wore out at some point.
After this series of events, Czar-Doon rejoined Yondu's Ravagers.[5]