Craven used the Gen-factor on many subjects, but all either died, went insane or mutated into monstrous beings. He finally succeeded with Team 7 and the survivors of the experiment were labeled Gen12. Later other Gen12-superhumans were seen, but the Team 7 members appeared to be the most successful and the most powerful of the Gen12.
Craven employed the Gen-factor on a wide range of subjects, with disastrous results – all perished, lost their minds, or evolved into grotesque beings. However, he eventually succeeded in creating a team of superhumans with Team 7, who were later labeled as Gen12. Subsequent Gen12 individuals were also discovered, but the members of Team 7 stood out as the most successful and powerful among them.