Mysterious Doctor Satan: Return of the Copperhead (1940)

Mysterious Doctor Satan: Return of the Copperhead (1940)

Mysterious Doctor Satan: Thirteen Steps (1940)

Mysterious Doctor Satan: Undersea Tomb (1940)

Mysterious Doctor Satan: The Human Bomb (1940)

Mysterious Doctor Satan: Doctor Satan's Man of Steel (1940)

Mysterious Doctor Satan: Double Cross (1940)

Mysterious Doctor Satan: The Monster Strikes (1940)

Mysterious Doctor Satan: Highway of Death (1940)

Mysterious Doctor Satan: Double Jeopardy (1940)

Mysterious Doctor Satan: Bridge of Peril (1940)

Mysterious Doctor Satan: Death Closes In (1940)

Mysterious Doctor Satan: Crack-Up (1940)

Mysterious Doctor Satan (1940)

Mysterious Doctor Satan: Disguised (1940)

Mysterious Doctor Satan: The Flaming Coffin (1940)

Mysterious Doctor Satan: Doctor Satan Strikes (1940)