In "Gavilan," Robert Urich is an ex-CIA agent who gets involved in high adventure and underwater hi-jinks as an oceanographer with a laser-equipped mini-submarine.
Robert Gavilan is an idealist in a hard world, which is why he's an ex-agent. He hates violence and says he "couldn't tell the good guys from bad guys." Tonight he risks his life for a scientist whose book was inspirational to him. After rescuing Sarah Snow, a colleague, from guerrillas in Africa, Gavilan learns that the lady's husband, a renown scientist, is still held captive by the terrorists. Sarah pleads Gavilan to return and attempt a rescue.
Gavilan and Dr. Maitland, an associate, are taken hostage by modern-day pirates. Gavilan (Robert Urich) draws the attention of pirates when he salvages gold from the deep off the Virgin Islands.
Gavilan is marked for death by a vengeance-seeking Japanese clan after he foils their attempts to steal an ancient sword. The sword, a Yakuza symbol, is in the hands of a girl who Gavilan has been dating.
Gavilan is held captive in Cuba by a Russian scientist as part of an ingenious plan to work on an experimental turbine and to get his daughter into America.
Gavilan and Mylo have to retrieve a high-speed boat which has been stolen by an arms dealer to turn it into a lethal weapon.
Milo (Patrick Macnee) is held hostage until Gavilan (Robert Urich) recovers $3 million in heroin.
Gavilan (Robert Urich) tries to rescue a friend from a Turkish prison.
Corrupt executives take over a corporation and use its fleet to slaughter whales. Gavilan becomes the scuba instructor for a boozing millionaire, hoping to straighten him out and get him to halt his whaling operation.
Gavilan tries to stop an American living in England from dealing stolen NATO arms to terrorist groups.
Gavilan is stalked by members of a Nazi faction who think he has the mysterious crystal pyramid they lost in a plane crash.