Satan's Triangle is an ABC Movie of the Week written by William Read Woodfield and directed by Sutton Roley that aired on January 14, 1975.
Coast guards Haig (Doug McClure) and Pagnolini (Michael Conrad) answer an SOS call and find a boat full of dead bodies, with no one alive except Eva (Kim Novak). When equipment failures force Pagnolini to return to shore by himself, Haig and Eva spend the night aboard the boat, and Eva tells Haig how the ships crew rescued Father Martin (Alejandro Rey), a priest who was adrift at sea, after which their problems began.
Satan's Triangle contains examples of:
- The Bermuda Triangle: All the disasters occur in the triangle, which Eva believes is the territory of Satan.
- Body Surf: Satan possesses first Martin, then Eva, then Haig. When he finishes using a body, it dies.
- Death by Materialism: Hal (Jim Davis), who was renting the boat, promised $5,000 to the captain if he could help him catch a large enough fish. Hal makes his catch, and pays up. When the captain runs to the engine room, he takes his money with him, and pauses at the base of the stairs to count it. Just then the boat pitches, smashing him through a closed hatch and killing him.
- Freeze-Frame Ending: The credits play over a freeze-frame of Satan using Haig's body to wave for help as he floats in the ocean.
- Impeded Communication: All the communication devices aboard the ship have died. Haig's radio dies while he's aboard.
- Jerkass: Hal shows himself to be one as his obsession with catching the marlin is shown. When the crew gets ready to rescue Father Martin, Hal is angry and threatening over the idea of abandoning the marlin for any reason. As it turns out, they should've listened to Hal.
- Littlest Cancer Patient: Martin was previously aboard another boat that was transporting Miguel, a seriously ill child, to a hospital where he could get surgery. Unfortunately, a storm destroyed the boat and drowned almost everyone aboard, including Miguel, leading to Martin getting picked up by Eva and the crew. Although, since we later learn Satan has possessed Martin, his story is suspect.
- Oh, Crap!: Pagnolini and Haig when they learn that the body hanging from the yacht's mast was a young woman, not the priest they reported, and that the woman they brought aboard the helicopter is also not what she appeared.
- Opening Scroll: "Within the last thirty years just off the east coast of the United States more than a thousand men, woman and children have vanished from the face of the earth. No one knows how. Or why. This is one explanation..."
- Screw This, I'm Out of Here!: When castaway Father Martin is rescued and brought aboard the boat, and the weather immediately turns ominously bad, the crew takes the motor launch and abandons ship, leaving Hal, Eva, Strickland and Salao behind.
- Scully Syndrome: Rational, atheistic Haig provides Eva with reasonable explanations for all the seemingly-supernatural deaths that occurred on the boat, which she eventually seems to accept. Then, Haig discovers he's completely wrong and Eva is really Satanically-possessed Martin.
- Slasher Smile: Eva puts one on when Haig learns the real Eva is actually dead. Then, the dead & possessed Haig has one as he awaits "rescue" as the credits roll.
- Special Thanks: "Our sincerest thanks to the 11th District United States Coast Guard, the officers and crew of the U.S.S. VENTUROUS and special thanks to helicopter pilot LCDR H.L. JOHNSON."
