The Secret Life of Walter Mitty (Deleted Frankenstein Scene)

The Secret Life of Walter Mitty had one known deleted scene that became the cause of much interest and mystery; a cameo appearance of the Frankenstein Monster.

The scene was important for multiple reasons; the appearance was approved by Universal Studios, the makeup was applied by Jack Pierce, and the Monster was portrayed by actor Boris Karloff; all three of these parties had contributed before to the Monster's iconic appearance in the 1931 film Frankenstein. Additionally, the scene may have been the only footage of the Frankenstein Monster filmed in technicolor.

Fans and historians first made the discovery of existence of the scene in 2007 after attributing a previously unknown behind the scenes still to the film's production. In total, three behind the scenes images are known to exist of Karloff in his Frankenstein makeup for the film. Without the footage or a script, the circumstances of the Monster's appearance aren't clear; it's thought to be a nightmare sequence showing the film's villain (also played by Karloff) as a literal monster. The reasons for the scene's deletion are also unknown.