Amityville 3-D (also known as Amityville III: The Demon) is a 1983 supernatural horror film directed by Richard Fleischer and starring Tony Roberts, Tess Harper, Robert Joy, Candy Clark, Lori Loughlin, and Meg Ryan. The third film based in the Amityville Horror series, it was written by William Wales, a pseudonym for David Ambrose. It was one of a spate of 3D films released in the early 1980s, and was the only Orion Pictures film shot in the format. It is an international co-production between Mexico and the United States.

Plot

After he exposes a pair of con artists with his partner Melanie in the infamous 112 Ocean Avenue house in Amityville, New York, journalist John Baxter is persuaded to purchase the house by real estate agent Clifford Sanders. While preparing the house for John, Clifford investigates footsteps in the attic. He is locked in the room, where a swarm of flies attack and kill him. John believes Clifford died of a stroke, even after Melanie shows him some photos she took of the real estate agent before his death, depicting him as a rotting corpse.