The Ghost of Slumber Mountain is a 1918 film written and directed by special effects pioneer Willis O'Brien, produced by Herbert M. Dawley, and starring both men. It is the first movie to show live actors and stop-motion creatures together on the screen and is often cited as a trial run for The Lost World.

The Ghost of Slumber Mountain originally took up 3000 feet of film and three reels, equivalent to approximately 40 minutes. However, after the film premiered at the Strand Theater, manager Walter Hayes ordered Dawley to cut the film down to about one reel because it was too long. A restored version runs approximately 19 minutes. The rest of the footage is presumed to be lost.


Most of the full plot is unknown. In the version available today, Holmes (Dawley) tells his nephews about an adventure he had in the woodlands around Slumber Mountain, near the Valley of Dreams. He finds the cabin belonging to the late hermit Mad Dick, who Holmes's friend Joe once saw carrying a strange telescope-like instrument. That night, Holmes searches the cabin and finds the instrument. Upon doing so, the ghost of Mad Dick (O'Brien) instructs him to use it to look at the peak of Slumber Mountain. When he does, he seemingly looks back into the past, seeing a Tyrannosaurus and a Triceratops doing battle. The Tyrannosaurus proves triumphant, and after killing the Triceratops, breaks the time barrier and begins chasing Holmes. It is then revealed that Holmes dreamed everything.

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