Michael suffers amnesia from a head injury sustained while investigating at a dam and reverts to his former identity as policeman Michael Long.

A killer with a treasure map must find his victim's estranged daughter, who holds the key to the treasure.

Michael and KITT are put on alert when an anonymous letter warns that a killer may strike at a Foundation sponsored motorcycle race.

Seeking revenge against Michael, old nemesis Garthe Knight kidnaps Devon, April and a scientist to force a showdown between KITT and his new and improved GOLIATH.