11. Adric
Boy genius and an insufferable, smug, know-it-all. Always certain that he knows better than The Doctor. A mathematical genius who is well aware of his superior intelligence and who won't let anybody forget it. He is arrogant and immature and endears himself to absolutely nobody. Adric finally rids everybody of his tediously obnoxious self in Earthshock, whilst trying to prevent a Cyberman-controlled freighter from crashing into and destroying Earth, only to be thwarted by a dying Cyberman blocking his final code. His dying words - "Now I'll never know if I was right" pretty much sum him up as an individual. Never forgotten, but not missed either.