Initially appearing in Space Sheriff Gavan, Den Iga is attacked by a monster called Buffalo Doubler, member of the Space Mafia Makuu. Den is seriously injured in the attack when he is found by Gavan, who takes him to Planet Bird for medical assistance. Qom, leader of the Galactic Union Police, is impressed by Den's courage. Den returns in the final episode of Gavan, saving Gavan himself in his newly acquired form of Space Sheriff Sharivan during Gavan's final battle. (wikipedia)