There were the episode movies.
Goliath:
Wilton Knight's estranged son Garthe returns to the USA from Africa to help a band of mercenaries steal nuclear missiles from a secret government facility. With the aid of his mother Elizabeth, they steal the formula for K.I.T.T.'s Molecular Bonded Shell, then apply it to a fourteen-ton, eighteen-wheeled monster Garthe calls Goliath.
Goliath Returns:
Garthe Knight escapes from prison with the aid of Goliath, rebuilt and now invulnerable thanks to the efforts of Adrianne St. Clair, who has also evaded justice. Together they set about kidnapping a prominent scientist in order to sell him to a foreign power, but not before Garthe has also kidnapped Devon and April to force a final confrontation with Michael and K.I.T.T.
Goliath TrailerGoliath Returns Trailer
