Danger Island (1931) is a Universal pre-Code film serial.

Kenneth Harlan played Captain Drake (the hero), and Lucile Brown played heroine Bonnie Adams.

Bonnie Adams is told by her father, Professor Adams, on his death bed of his discovery of a radium deposit on an island off the coast of Africa.

Ben Arnold and his girlfriend Aileen want the radium for themselves and befriend Bonnie for that purpose.

The captain of the boat taking them to their destination, Harry Drake, falls in love with Bonnie en route.