Oombar was the Circus Horrificus' combat champion in their traveling arenas. Because of his huge size, he was often pitted against entire legions at a time. Oombar has fought Mantellian Savrips and emerged victorious. Once he even defeated a Rancor bare-handed. Although they made many credits from his battles, his handlers treated him with no respect. Oombar joined DEADLINE as the team's powerhouse after he befriended Twigg, the youngest member.