When a mysterious planet comes hurtling through space threatening to destroy Earth, Flash fearlessly meets the challenge. He falls into the clutches of the merciless Ming and is forced to battle for his life against huge, ape-like man-killers.
Escaping the threat of the ape-like killers in the arena, Flash must now face a battle with Thun and the Lion Men in a struggle that almost costs him his life.
After thwarting Ming, who intended to force Dale into marriage, Flash faces the terrors of the dreaded King Kala and his Shark Men.
When Aura cuts off the air supply to Kala's underwater palace, Flash rushes to the aid of Dale.
Ming saves the doomed Shark City and delivers Flash and his friends into the hands of the Hawk Men. At the same time, King Vultan plots against the Prince of Justice.
Upon landing in Sky City, Flash and his friends are immediately taken prisoner by Vultan, who demands that Dale renounce Flash forever.
Flash is threatened by Vultan's atom furnaces and electro-charged mechanical devices.
Flash is pitted against his own friend, Prince Barin, in a deadly battle that results in another battle with the Orangopoid.
Outraged by Flash's defeat of the Orangopoid, Ming orders an injection of "drops of forgetfulness" and sends him to the abode of the sacred Fire Dragon.
Flash's memory is gone, but Zharkov accomplishes a memory restoration.
With the aid of an invisibility machine, Flash releases Vultan, and together they prepare to return to Earth, while enemy Aura makes plans to intercept them.
Prince Barin persuades Aura to help with their escape. The Earth party assembles in the Turret House, which is set aflame by fire from a mysterious rocket ship.
Escaping from the Turret House by an underground passage, Flash and his friends return to an electrically protected laboratory. Ming, under attack by Thun's rocket ship, flees to exile in the Palace of Tao.
By means of a powerful Nitron Lamp from Mars, Ming and Azura plot to destroy the Earth. Flash Gordon travels to Mars, where the Martians open fire with a powerful ray gun.
Attacked by the mystical Queen of Magic, Azura, Flash is forced to land in the Valley of Desolation with the Martians in hot pursuit.
Flash and his friends are captured and made slaves by the clay people, and Flash poses as a Martian pilot in order to trick Azura into revealing her magic secrets.
Flash's intention of liberating the clay people is misinterpreted, and he must fight for his life in an aerial dogfight.
Setting out with Dr. Zharkov's paralyzer gun to rescue Dale from the clay people, Flash and the professor are detected by Ming, who sends a space bomber to capture them ... alive!
Flash and his friends seek to enlist the support of the tree people in the war against Ming and Azura, who in turn attempt to turn the tree people against Flash.
Imprisoned by the tree people in a deep underground cave, Flash learns the secret of Azura's magic and tries to escape.
After obtaining the sacred Black Sapphire and imprisoning Queen Azura, Flash attempts to use his newfound magic to destroy the Nitron Lamp.
Queen Azura escapes, regains her power and orders her guards to capture Flash.
Unbeknownst to Flash, Dale Arden is taken prisoner by the tree people and, under the influence of the Incense of Forgetfulness, is forced to take an oath to serve their great god, Kalu.
Determined to dispose of the Earthmen for good, Ming and Azura prepare a trap for Flash and Dr. Zharkov, who try to revive Dale.
After capturing Ming and Azura on the way to the clay people, the merciless one unfolds his bat wings and escapes.
Ming returns to the palace and commands the bombing squadron to stop Flash and Azura, forcing them to seek refuge among the rocks. The clay people are restored, but Ming continues his attempts to annihilate them.
With the support of a Martian pilot, Flash makes his way to Ming's palace and turns the Martians against the evil villain.
With Ming's own men turning against him and the destruction of the Nitron Lamp accomplished, Flash and his friends return to Earth to a well-dressed heroes' welcome.
