Michael Long is a crimefighter who is seriously wounded during his work. Nursed back to health by a mysterious benefactor (chairman of the Knight Industries), he regains consciousness a new man with a new face and a new name: Michael Knight. His mysterious benefactor (through the guise of associate Devon Miles) provides Michael with equipment and support so that he can continue his crime fighting work. The most notable piece of equipment supplied, is "KITT", a high-performance sports car fitted with artificial intelligence.

Michael Long is a policeman, while investigating someone, he was shot and left for dead. But a millionaire, Wilton Knight finds him and saves him and gives him a new face. It seems that Knight wants to wage a war against criminals who operate above the law. And Michael is the man he has chosen to wage that war. He has created the ultimate car, the Knight Industries Two Thousand or KITT, which is laced with a virtually indestructible alloy, and is also capable of moving on its own and also talks. He gives the car to Michael, and gives him the new identity of Michael Knight. Michael is assisted by one of Knight's associates, Devon Miles. Bonnie is the mechanic who takes care of KITT. During the second season Bonnie was replaced by April, as the new mechanic. The folowing season she left and Bonnie returned. The next season they acquired a new member, Reginald Cornelius III or RC3.

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