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From the liner notes

Airwolf heads to the skies for its stunning final flight in all 24 episodes in the fourth season of one of the most action–packed adventure series ever made. Piloted by Stringfellow Hawke's long–lost brother, Saint John (Barry Van Dyke), the stage is set for air battles unlike anything seen before. Joined by a new crew comprised of Dominic's resourceful niece, Jo (Michele Scarabelli), rebellious Major Mike Rivers (Geraint Wyn Davies), "Company" agent Jason Locke (Anthony Sherwood) and Newman, Locke's mysterious supervisor and F.I.R.M. agent (William B. Davis)—Airwolf faces down its greatest challenges yet: from the threat of nuclear meltdown to contraband weapons and radioactive clouds. It's explosive action from start to finish in the show that took adventure to new heights.