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Archenemy of Michael Knight
Garthe Knight is the son of Wilton and Elizabeth Knight, and the brother of Jennifer Knight. His appearance is identical to Michael Knight, but with the addition of a moustache and small beard. The reason he looks exactly like Michael Knight is because Wilton Knight changed Michael Long's face to look like Garthe when he created the new identity "Michael Knight". He was a vicious criminal mastermind that has had a few run-ins with Michael Knight cementing his place as his archenemy he has his own attack vehicle an armoured semi truck he named Goliath which he built during his time in prison, he then stole the plans for a molecular bonded shell the same formula which makes K.I.T.T. invulnerable armed with this behemoth he set out to kill Michael and destroy K.I.T.T. and he almost succeeded, but during their final confrontation Michael and K.I.T.T. go near the edge of a cliff and use the grappling hook to save themselves. Garthe is about to ram into K.I.T.T., but Goliath goes off the cliff and into the sea, killing Garthe.
- In the series, he was played by David Hasselhoff. In LEGO Dimensions, he is voiced by Piotr Michael.
- Michael also voices Michael Knight.