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Official Site: DC Comics

Ultra Boy (Jo Nah of the planet Rimbor) is a fictional character, a comic book superhero in DC Comics. He is a member of the Legion of Super-Heroes in the 30th and 31st centuries of the DC Universe. Ultra Boy gained his powers when the vehicle he was flying through outer space was swallowed by an ultra-energy beast (a "space whale"), exposing him to radiation while inside. His real name is derived from the biblical figure Jonah who also survived being swallowed by a "large fish" (often interpreted to be a whale).

Ultra Boy first appeared in Superboy #98 and was created by Jerry Siegel and Curt Swan.

Ultra Boy first appeared in Superboy #98 (1962), in which he was sent back in time to Superboy's home town of Smallville to prove himself worthy of joining the Legion by learning Superboy's secret identity. In his first adventure he only demonstrated his vision powers, known as "penetra-vision". It was implied he had malicious intentions in learning Superboy's secret identity. Later, in Adventure Comics #316, he explained that he could channel his ultra-energy to provide him other powers, though only one at a time. Later he was romantically linked for many years with fellow Legionnaire Phantom Girl. He was considered one of the Legion's 'big 3' (along with Superboy and Mon-El) and served two terms as leader.

The names of his parents are Crav and Mytra Nah. His girlfriend on Rimbor before he joined the Legion was An Ryd; she is later murdered by Pulsar Stargrave, who frames Ultra Boy for the crime.

Ultra Boy has not been a contender in any CBUB matches.