Many, like ex-punk rocker and special Explorer correspondent Henry Rollins, have struggled with feelings of aggression their entire lives, and NGC is on a mission to figure out why. Scientists are investigating a single gene -- dubbed the warrior gene -- that has been associated with violent behavior, raising the disturbing possibility that some people are Born to Rage. Henry tests this theory on a colorful crew: outlaw bikers, mixed martial arts fighters, monks and former gang members.