In this satire of 1950s sci-fi matinees, Lou Costello plays an amateur scientist who invents a time machine that also has a way of changing people into strange things as it moves them through time.
In the late 19th century, Captain Robur, a mad scientist, kidnaps a team to investigate a mysterious crater in Pennsylvania. He decides to destroy weapons of mass destruction to bring world peace.
After the death of Cyrus, his attorney Corby invites his relatives and Joyce Norman is declared as the sole beneficiary. Cyrus has drafted a second will that puts Joyce's life in danger.