Unk tells a story to his two nephews about the time when he and Joe visited the stone-covered grave and haunted cabin of Mad Dick where they (and their dog, Soxie) were able to view the prehistoric past through a queer looking instrument that accidentally allowed T. Rex onto Slumber Mountain. Sadly, at the end, Unk suggests that it was all a dream, but what does he know?!

The IMDb lists Herbert M. Dawley as a co-writer, but Wikipedia lists him as only the producer. The initial three-reel film premiered at the Strand Theater, but an unhappy Dawley cut it from over 40 minutes to about 12. Around six extra minutes were later restored by the Dinosaur Museum of Blanding, Utah, in 2016, but the full version no longer exists.
—Michael Main
Far, far away, at the foot of a cliff, a Thunder Lizard—which must have been at least one hundred feet long—appeared out of the mists of forty million years.

Tags

(5)

Variants

(3)
  1. three reels, over 40 minutes.
    The Ghost of Slumber Mountain, no credited writer or director (premiered at the Strand Theater, Dorcester, Massachusetts, 17 November 1918).
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Willis H. O’Brien [uncredited]
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . directed by Willis H. O’Brien [uncredited]
  2. abridged to 12 minutes.
    The Ghost of Slumber Mountain, no credited writer or director.
    3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Willis H. O’Brien [uncredited]
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . directed by Willis H. O’Brien [uncredited]
  3. partly restored to 19 minutes.
    The Ghost of Slumber Mountain, no credited writer or director.
    4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Willis H. O’Brien [uncredited]
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . directed by Willis H. O’Brien [uncredited]

Indexer Notes

(2)
  1. Credits—Although the IMDb lists Herbert M. Dawley as a co-writer. However, Wikipedia indicates otherwise, and we have chosen to not credit Dawley.
  2. Release—At the Strand Theater on 17 November 1918, according to Wikipedia. This is presumably the Strand in Dorchester, Massachusetts, which opened on 11 November 1918.