你指係Rex? 佢係科學家, 見到有一個發明 (nano-mite) 之後就希望擁有呢個技術, 剛好個轟炸早咗令佢毀咗容, 仇恨心+野心咪令佢變壞咗囉.
"...For most of the movie, he is referred to as the "The Doctor", a scientist working with James McCullen with his research on nanomites. It is revealed that he was Rex Lewis, the younger brother of Ana Lewis (later The Baroness) and once a soldier alongside Duke. Rex was presumed dead after a building Duke sent him into was hit with a premature air strike called in by Duke and was left for dead. But in reality, prior to the explosion, Rex saw McCullen's early experimental research on nanomites conducted by Doctor Mindbender and was in awe of the sight. Surviving the incident, yet severely scarred, both physically and mentally, Rex learns from Mindbender and perfects the nanomites, using his own sister as a test subject in creating the Neo-Vipers as well as having a vendetta against Duke for leaving him to die...."
Source:
http://en.wikipedia.org/wiki/Cobra_Commander