Flash Gordon, Dale Arden and Dr. Zarkov return to the planet Mongo for an antidote to the Purple Death, which wreaking destruction on Earth. However, Ming the Merciless has other plans for them.
| Actor | Role |
|---|---|
 Buster CrabbeFlash Gordon | Flash Gordon |
 Carol HughesDale Arden | Dale Arden |
 Charles MiddletonMing the Merciless | Ming the Merciless |
 Anne GwynneSonja | Sonja |
 Frank ShannonDr. Zarkov | Dr. Zarkov |
 Shirley DeanePrincess Aura | Princess Aura |
 Lee PowellRoka (an Arborian) | Roka (an Arborian) |