Steve Austin (Lee Majors), now a disenchanted loner, is persuaded out of seclusion by his old friends at O.S.I. in order to help them put a stop to a group of international terrorists known as Fortress. His former lover, Jamie Somers (Lindsay Wagner), is also begged to join in the struggle. Austin and Somers not only find their old powers are rusty, they must also learn to overcome their personal suspicions of each other and work together, especially when Austin’s son is badly injured and then kidnapped by Fortress.