A mysterious plague called the Purple Death ravages the earth.

Flash and friends arrive on Mongo they seek allies to fight Ming. then they break into Ming's laboratory and are attacked by a giant of tremendous strength.

Flash is rescued from the energy pit. Barin discovers an antidote for the purple death. Flash and friends go to collect the antidote and are attacked by Ming's men.

Ming hears over the radio Flash telling his father he has discovered a antidote for the Death dust Ming is attacking the earth with. Ming sends Torch and a mechanical army to stop Flash.

Flash and Roka capture a Ming ship, infiltrate Ming's palace in disguise and attempt to rescue Zarkov from the death ray in the arena.

Flash and Roka disguise themselves as guards and return to Ming's palace to rescue Dale and Zarkov.