Knock Out is the Decepticon's version of Ratchet and the only known Decepticon doctor. He is also a scientist and inventor (though not so talented as Shockwave, of course). However, rather than being grumpy, Knock Out is incredibly vain, snobbish and sly. He takes little care of his patients and values his own splendid appearance over all else. Like Ratchet, he is reluctant to join a battle, but his reason is quite different: he is afraid of being scratched.