Dr. Otto and the Riddle of the Gloom Beam is a 1985 American science fiction comedy film starring Jim Varney.

He is plotting world domination using his "gloom beam," an electromagnetic device that he uses to launch attacks on financial institutions to erase their contents and cause worldwide chaos.

To foil Lance, Dr. Otto uses a "changing coffin" and transforms himself into various characters in an effort to stop the heroes: Rudd Hardtack, Australian trainer of child militants; Laughing Jack O'Cockney, pirate captain; Auntie Nelda, the cantankerous elderly woman; and Guy Dandy, wealthy playboy.

He chooses the Right Button and massive electric bolts fire off in all directions; the lair self-destructs.

As they all push the car down the road, Ernest takes his hat off to reveal Dr. Otto's third hand.