7. Arthur Petrelli (Heroes)
Arthur Petrelli was the founder of
The Company; an organisation that has an interest in locating and tracking evolved humans. Arthur was an evolved human himself, with the ability to steal other evolved humans' abilities through physical contact. This ability corrupted him. He craved more power and he ended up assembling a team of evolved human villains to carry out his plans. If Arthur learned of the Doctor's existence, he would crave his otherworldly genius and ability to regenerate - though he would soon realise that the Doctor's abilities weren't those of an 'evolved human' and would end up making himself an enemy that he wish he'd never tangled with. The Doctor could put an end to Arthur's plans - and bring down
The Company - without so much as batting an eyelid.