Jer Bear is the poster-child of Upgening gone too far.
Originally Jeremy Rogers, a noted pugilist on the outer-rim fighting circuit, Jer Bear first dipped his toes (paws?) into the altered-gene pool to gain an edge in the ring. And it worked. With his new bearlike strength and ferocity he was soon winning every match against even the highest ranked fighters in the outer rim. Drunk with power and flush with cash, he foolishly elected to have yet another Upgene procedure while his previous gene sequence was still active - creating an exponential cascade in his gene transformation. Jer Bear quickly started to become more bear than man, and was disbarred from the fighting world after literally devouring an opponent in the ring.
Fleeing certain incarceration, Jer Bear used what was left of his rapidly diminishing intellect to escape incarceration by jacking a [[Heliobooster]] and heading for Earth. Unfortunately, his transformation continued during his journey and he was no longer able to control his craft with his giant bear paws (and tiny bear brain). After weeks of drifting, he was saved from a lonely death by Dylan, who intercepted him while on a reconnaissance mission. Recognizing Jer Bear from the Multicorps Security Forces’ Most Wanted transmissions, he impulsively decided to take the furry fugitive back to Bear City.
Outwardly he is indistinguishable from a grizzly bear; inwardly, no one really knows how much human is left inside that massive head of his. But despite being 98% wild animal, he recognized that his life was saved, and to this day displays an undying loyalty to the Bear City crew. He often accompanies Primary Flight Controller on risky trade missions to provide an added level of intimidation and security.