FLASH GORDON AND ZYDEREEN OF NEPTUNE

To relieve his boredom, Emperor Ming the Merciless of the planet Mongo begins Earth's destruction by remotely causing natural disasters. On Earth, football star Gregory "Flash" Gordon boards a small plane and meets travel agent Dale Arden. Mid-flight, the cockpit is hit by a meteor and the pilots die. Flash takes control and manages to crash land into a greenhouse owned by former NASA scientist, Dr. Hans Zarkov. Zarkov believes that the disasters are being caused by extraterrestrials pushing the Moon towards Earth. He has secretly constructed a spacecraft to investigate the attacks. Unable to do it alone, Zarkov lures Flash and Dale aboard. He flies with them to Mongo, where they are captured by Ming's troops.

After looking at the trio, Ming is smitten with Dale and orders Flash executed. At the last minute, Ming's daughter, Princess Aura, saves Flash, with whom she fell in love at first sight. While they escape, Zarkov is brainwashed by Klytus, the head of the secret police. Aura and Flash flee to Arboria, kingdom of Prince Barin. Locked in Ming's bedchamber, Dale escapes, and Zarkov is sent to intercept her. However, Zarkov reveals he resisted the brainwashing, and escapes Mingo City with Dale. They are quickly captured by Prince Vultan's hawkmen and taken to Sky City.

Aura and Flash arrive at Arboria. Aura asks the Prince to keep Flash safe. A distrustful Barin, in love with Aura, agrees not to kill Flash, but then forces him to play a deadly game of chance. With the odds stacked against him, Flash uses this opportunity to escape. Barin follows him, and they are both captured by the hawkmen.

Aura returns and is taken prisoner and tortured by Klytus and General Kala for her treason. Meanwhile, Ming prepares his wedding to Dale. Flash and Barin are taken to Sky City, where Flash and Dale are briefly reunited. Flash is forced to fight Barin in a death match. However, Flash instead saves Barin's life, causing Barin to join him. Klytus arrives, and Flash and Barin kill him. Knowing this will bring retribution, Vultan and the hawkmen evacuate, leaving Barin, Flash, Dale and Zarkov behind. Ming's ship arrives and captures Barin, Zarkov and Dale. Impressed with Flash, Ming offers him lordship over Earth in exchange for loyalty. Flash refuses and Ming gives the order to destroy Vultan's kingdom along with Flash. Finding a rocket cycle, Flash escapes before Sky City is destroyed.

Flash contacts Vultan, and they plot an attack on Mingo City. To defend the city, General Kala dispatches the war rocket Ajax, which is quickly seized by the hawkmen. Meanwhile, Princess Aura overpowers her guard and frees Barin and Zarkov from the execution chamber. Flash and the hawkmen attack Mingo City in Ajax and Kala activates the defenses as Ming's and Dale's wedding begins. Mingo City's lightning field can only be penetrated by flying Ajax into it at a suicidal speed. Flash volunteers to stay at the helm to ensure success and enable the hawkmen to invade the city.

Barin and Zarkov enter the control room and confront Kala. In the ensuing fight, Barin shoots and kills her.

After fighting through Ming's guards, Barin also manages to deactivate the lightning field before Ajax hits it. Flash flies the rocket ship into the city's wedding hall and impales Ming. Flash offers to spare his life if he stops the attack on Earth. Ming refuses and attempts to use his power ring on Flash, but it falters and nothing happens. He then aims the ring at himself and is seemingly vaporized by its remaining power. A victory celebration ensues.

Barin and Aura become the new leaders in Ming's place. Barin names Vultan the general of their armies. Flash, Dale and Zarkov discuss returning to Earth. Zarkov says he does not know how they will get back, but they will try.

Meanwhile, Ming's ring is picked up by an unseen person. Ming's evil laugh is heard closely after.

Flash and his allies launch an assault on Mingo City to stop Emperor Ming's plans, culminating in a confrontation during Ming's wedding to Dale and a daring attack on the city's defenses.

The climax unites Mongo's rival factions and demonstrates the power of teamwork and defiance against tyranny. Flash's refusal to accept Ming's offer and his willingness to risk everything signals his transformation from accidental hero to savior, capping off the serial's classic battle of good versus evil with a rousing, high-energy finish.