Season 4

In the rubble of the destroyed Command Center, the Power Rangers find the Zeo Crystal.

The Rangers face their greatest challenge as Zordon explains that King Mondo is preparing to invade the Solar System, his final link in a chain of galaxies he already controls.

When Mondo and Machina unleash the Staroid on the Zeo Rangers, they are forced to call on their untested Zeo Zords.

The computer software that Rocky, and his new friend Jennifer are working on, is stolen by the Cogs and used against the Rangers.

Tommy and Katherine take care of a baby for a school assignment giving King Mondo an idea for his evil ambitions.

The teens' baseball team provides the perfect outlet for Prince Sprocket to do battle with the Rangers when he turns their batting machine into the People Pitcher.

Smokey, a specially trained dog, aids the Zeo Rangers in fighting Digster, Mondo and Machina's latest monster.

When Ernie brings a puppet show to the Youth Center to entertain the children of Angel Grove, Mondo and Machina hatch a plan to control the children's minds, by planting a transmitter on the Puppet Man.

Prince Sprocket recruits the Rangers to be in his own twisted movie; "Invasion of the Ranger Snatchers."

As Billy learns he has accumulated enough credits to graduate from Angel Grove High, Cestro, the Blue Alien Ranger, lands on Earth seeking Billy's help.

As Rocky and Adam work on developing hybrid plants for Botany class, Rocky's plant exhibits weird behavior, growing rapidly and developing an appetite for metal.

A mysterious musician in Angel Grove High is pursued by Prince Sprocket and King Mondo.

Tanya and Adam are exploring the new world of cyberspace with the help of Raymond, a computer whiz, at school. When they run into a computer virus, Mondo gets the idea to create Mean Screen, a horrible computer monster that will infect all of the computers in Angel Grove.

As Billy is returning from Aquitar in a space capsule, Machina and Mondo attack his space craft, sending it into the gravitational pull of the Machine Skybase.

Tommy receives a "Dear John" letter.

Mondo and Machina send the Defoliator to create a greenhouse effect in Angel Grove.

As Katherine tries to console Tommy about his "Dear John" letter from Kimberly, a spark of attraction begins to form between the two Rangers.

On a journey to find True of Heart, Tommy comes upon the incredible discovery of a young man who looks just like him.

Searching for the other half of an arrowhead, Tommy discovers its owner is his brother.

Having kidnapped Tommy's newfound brother David, King Mondo blackmails Tommy into giving up his half of the arrowhead, in order to set David free.

Now that he has both halves of the arrowhead, King Mondo vows to destroy the Zeo Rangers, while continuing to refuse the release of Tommy's brother.

King Mondo sends down the Defector robot to trick the Zeo Rangers into gaining their trust, and thereby able to destroy them.

Adam experiences a nightmarish scenario when the Machine Empire invades Earth overnight and transforms many of Adam's friends into sinister scientists, werewolves, and dark forces.

Bulk's infatuation with the daughter of a high ranking officer soon puts both his, Skull's, and Lt. Stone's careers in jeopardy.

Tanya's potential new singing career divides her time between fulfilling an ambition and serving as a Ranger

King Mondo attempts to rule the Earth's waterways by building a fleet of ships under an invisible field.

King Mondo's plan to divide and conquer the Zeo Rangers is spoiled by the appearance of the Gold Ranger.

The other Rangers must find a way to help their friends when Prince Sprocket shrinks Tommy and Katherine and places them in a terrarium with a hungry spider.

Katherine competes in a surfing competition, but faces danger when the Leaky Faucet monster puts toxic Cog oil in all the water in Angel Grove.

The Somnibot casts a sleeping spell on the people of Angel Grove, leaving it to the Gold Ranger to break the spell.

The Gold Ranger finds asylum in the Power Chamber from the evil Mondo, Machina, and the Varox bounty hunter.

When the Gold Ranger is attacked by Varox Bounty Hunters, Pyramidas is hit, and falls into the seas of the planet Aquitar.

Time is running out for transference of the Golden Powers.

King Mondo is determined to use the Damocles Sword to destroy the Zeo Rangers.

The teens are helping Ernie set up for his new Beach Club when a group of tough teens ride in and begin to trash the place.

The teens are involved in a charity fashion show for the famous designer, Mr. Stenchy.

Aisha sends Tanya a map of Mysterio Island, the island on which Tanya suspects her parents have been missing for years.

When Katherine stages a ballet about King Midas, Louie Kaboom creates the Midas Hound, an idol that changes everything into gold.

A practical joker wrecks havoc on Angel Grove High. While Bulk and Skull try to track down the trickster, Prince Sprocket's brother, Prince Gasket and sister-in-law, Archerina, arrive with a few new tricks of their own!

While jet skiing on the lake, Tommy is mysteriously disappears.

The Zeo Rangers discover that Tommy has been captured by Prince Gasket, and placed in a large arena with monsters battling one another.

The Gold Ranger is forced to defend himself when the brainwashed Tommy attacks him.

Tommy is confused when he keeps reliving experiences of the day over and over.

The teens all dress in classic mystery character costumes when they participate in a charity dinner organized by Detective Stone.

Tommy asks Tanya for voice lessons when he has to sing in front of the class.

Everyone is stunned when it is revealed that Billy has aged into an old man.

The Power Rangers Zeo team up with the Alien Rangers of Aquitar to combat a double threat from King Mondo and Lord Zedd.

The golden powers start to fade from Jason.

Jason, who is continuing to lose the golden powers, is confronted by Rita and Lord Zedd.

The Rangers, together with their friend Raymond, help Ernie set up for a multicultural holiday banquet, and in the process learn how different cultures celebrate the holidays.