There were, in fact, actually four 8mm reels released (which could be purchased in color or black & white, sound or silent), serializing the feature. This digest, when the reels were combined, runs about 36-40 minutes, depending on whether you were using the silent or sound versions. A well-edited condensation of the feature film. (The four reels were 1. "The Cyclops," 2. "The Strange Voyage," 3. "The Evil Magician" and 4. "The Dragon's Lair.")