Plot[]
Billy is rapidly and uncontrollably aging, King Mondo has unleashed Cog Changer to steal the Zeo Megazord, and Rita Repulsa has created an invincible monster. The Zeo Rangers must once again join forces with the Alien Rangers of Aquitar to deal with these multiple situations.
Synopsis[]
Part I[]
At the Juice Bar, Kat is moaning over the ugly-looking pink purse she had made in Art class. Adam and Tanya attempt to cheer Kat up, which somewhat works. Nearby, Bulk and Skull are studying for the exams to earn their detective licenses, with Detective Stone pressuring them on. The girls and Adam laugh, until Jason arrives and tells them they have an emergency and need to be at the Power Chamber immediately. The four leave and pick up Rocky.
Arriving at the Power Chamber, the Rangers meet with Tommy, Alpha 5, and a strange old man... who introduces himself as Billy. Seeing his friends confused, Billy recounts when Master Vile reversed time and turned them into kids. Billy had used his Regenerator device to restore himself to his normal age before it was destroyed, but now it's revealed to have a disturbing and dangerous side-effect: Its sped up Billy's aging process and he's literally getting older every minute. Not even Zordon is able to find a solution to Billy's condition, but Billy seems to have an idea.
In the Machine Moon Base, Queen Machina is ecstatic to be reunited with King Mondo after his lengthy repairs, while Prince Sprocket informs his father of Gasket's attempts to usurp the Empire in his absence. Mondo, not suprised, tells him that he will deal with Gasket later. For now, they need to deal a bigger issue involving Lord Zedd and Rita Repulsa since he got word that the two have returned to the Moon and are attempting to retake control again. Listening in from a hideout on Earth, Gasket and Archerina are less-than-pleased at Mondo's plans to punish them and decide to flee the planet for now.
Back at the Juice Bar, Kat and Billy are pouring through the Lost & Found in hopes that someone found any other of Billy's devices, but there aren't any there. Billy does find Ernie's toaster to his delight and Kat's ugly purse to her disappointment, plus a whistle which proves handy in getting an eavesdropping Bulk and Skull off their backs.
Elsewhere on the Moon, Rita has received a new, more powerful magical staff from Finster, and she gets the idea to use the staff to bring Kat back to her side as a villain. Back at the Youth Center, Kat notices Billy's getting worse so they leave. While the RV drives into position for the shot, Rito Revolto and Goldar squabble over seating arrangements. Their fighting accidentally makes Lord Zedd drive the vehicle off-course as Rita fires her staff, causing the shot to instead hit Kat's ugly purse and turn it into a new monster -- The Impursonator. She is seen cackling in delight over her creation. Viewing Impursonator on the Repulscope, Rito compliments Rita on the monster she had created. She is however not impressed and is wondering how she could've made such a mistake. Lord Zedd mentions they should worry about that later and focus on what they're going to do when Mondo learns of their return. Not one to be outdone by their efforts, Mondo sends out his greatest monster -- Cog Changer.
Back at the Power Chamber, the effort to find a solution to Billy's problem is no more successful. Fortunately, two familiar friends arrive to help: Delphine and Cestro of the Aquitian Rangers. The two attempt to restore Billy using a Regenerator of Cestro's own design, but the device backfires and takes out the teleportation unit. Though Delphine and Cestro repair the device, they need very fresh water for it to work as the backfire has contaminated the water they brought with them. Rocky suggests going to Angel Grove Falls, and Billy recommends that they take the Zeo Jet Cycles.
The alarm suddenly sounds as both Mondo's and Rita's monsters are detected. Jason volunteers to get the water while the core Zeo Rangers morph into action. As they ride into battle, Cog Changer appears and hits the Bikes with remote devices, causing them to go haywire and crash into an abandoned shack containing fuel drums. The Rangers quickly leave before the fuel drums explode, destroying the shack and the Bikes. Mondo then arrives with a Cog army to pound on them further. The Rangers are horrified that Mondo's back. They fight the cogs, but the monster has enhanced their defenses with his remote devices. The fight is quickly interrupted when Rita and Zedd enlarge Impursonator to steal Mondo's glory.
The Zeo Megazord is summoned to fight the larger threat, but all of its attacks and the Zeo Battle Helmets prove unable to beat the her blubbery body and electrical counterattacks. The Red Battlezord joins the fight and pushes Impursonator back, while Mondo orders Cog Changer to move in. The monster agrees and secretly plants an evil cog inside the Zeo Megazord. The Rangers are oblivious of the sabotage as they form the Zeo Mega Battlezord, bring Jason's Gold Ranger powers into the battle with Pyramidas, and even launch the Zeo Ultrazord, but Impursonator resists and counters everything thrown at her. The Rangers are ultimately forced to retreat, but Rita and Zedd's victory is ruined when Mondo teleports their monster to another planet out of spite. He then boasts that thanks to Cog Changer's sabotage, the Zeo Megazord will destroy the Rangers the next time it's activated.
Back at the Power Chamber, the repaired Regenerator is used but fails to have any effect on Billy. Between this failure, Cog Changer on the loose, and Impursonator still a threat, the situation is indeed dire. They receive a transmission from Red Aquitian Ranger Aurico who says that he, Tideus and Corcus are standing by to offer assistance at the first sign of trouble.
Suddenly, Zordon picks up a reading in the Zeo Zord holding bay, specifically inside the Zeo Megazord. Disregarding concern over his condition, Billy goes inside the Zeo Megazord to investigate and run a system check, only to become trapped when the evil cog activates the Megazord and makes it fly out of the holding bay.
Part II[]
With the Zeo Megazord on a rampage and Billy still trapped inside, the Rangers try to repair the damaged teleportation unit so as to get him out of trouble. The targeting systems are still offline, making a precision teleport from within the moving Megazord impossible, so the Rangers launch the Super Zeo Megazord to hold it in place long enough to get a lock. Thanks to Cestro's "unique" repair methods, Alpha is able to lock on and teleport Billy back to the Power Chamber.
Zordon reports that Cog Changer has commandeered the Zeo Megazord, his prior sabotage allowing him to bypass the defense mechanisms, and the Rangers are forced to fight it off with the Super Zeo Megazord. Meanwhile, Billy has aged even further. At Alpha's calculations, he'll reach age 100 within the next hour.
On the Moon, Rita is jealous at Mondo's monster turning a Megazord against the Rangers, while Zedd is merely apathetic. Finster, however, reports that Impursonator is already on her way back to Earth. Her arrival comes as a complete and literal shock to the Rangers, as she teleports into the Super Zeo Megazord and ejects them before turning her attention to Cog Changer. As the two Megazords begin tearing through Angel Grove, Bulk and Skull are beginning their detective license exams. They assume that the alarms, earthquakes and sounds of destruction are part of the exam to see if they can concentrate under fire, so they ignore the chaos, even as the office collapses around them.
With limited options, Jason summons Auric the Conqueror in order to stop the fighting, but Auric's attempt at a peaceful resolution between the Megazord-piloting monsters backfires when Impursonator banishes him away. On Sprocket's suggestion, Mondo then adds injury to insult by sending Cogs to kick the Rangers while they're down.
After a short fight, the Rangers return once more to the Power Chamber. Delphine reports that there may yet be a way to save Billy. She tells them of the Eternal Falls, a mystical source of water similar to the fountain of youth as it makes Aquitians young and healthy, but Cestro warns that its effects on humans are unknown. Billy is willing to take the risk and has asked that a friend of his from Aquitar, Cestria, bring him some of its water. Delphine also reports on an observation she made: Impursonator's easily distracted, leading Kat to come up with a plan.
The core Zeo Boys arrive to taunt Impursonator, who takes the bait and abandons the Super Zeo Megazord to fight them. Rita instead pulls her monster out of battle to scold her and punish her for such a costly mistake. She orders Impursonator to sit down and think about what she done. This makes her cry as Zedd tells her that while she's thinking about it, Impursonator better come up with a better plan to help them. Before he can finish punishing her, Rita kicks him. Meanwhile, The core Zeo Boys take back the Super Zeo Megazord and hold Cog Changer back while the girls slip into the Zeo Megazord. Using their Power Pod Swords, Tanya destroys Cog Changer's evil part and Kat ejects the unwelcomed pilot. At the Power Chamber, Cestria gives Billy the water from the Eternal Falls, which briefly works but fails to have any lasting effect. It's decided that Billy must go to Aquitar for extensive treatments, and Billy asks Jason to tell the other Rangers of the news as he and Cestria teleport away.
The alarm sounds as Cog Changer and an army of Cogs converge on Angel Grove Colosseum, along with Impursonator. As Jason heads back to action, the entire team of Aquitian Rangers join him to unite with the Zeo ones, sparking an enormous battle royale between Rangers and monsters. As the Cogs are dispatched, Klank and Orbus arrive to enlarge Cog Changer, while Rita and Zedd cross their staffs to make Impursonator grow. The core Zeo Rangers bring in the Super Zeo Zords to deal with the giants while Jason and the Alien Rangers finish off the remaining Cogs.
Sprocket then hits on the idea to combine both monsters together, creating the Cog-Impursonator. The Super Zeo Megazord is formed, and the Zeo Megazord, Red Battlezord, and Warrior Wheel are summoned to join in. Together, the two Megazords and the Red Battlezord throw the Warrior Wheel among them and trap the fused monster in the middle of an energy vortex they create, weakening Cog-Impursonator enough for the Warrior Wheel to destroy it in a final strike. The core Zeo Rangers jump down and Thank the Aquitians for helping them again.
The next day, Bulk and Skull get their exam results from Det. Stone. The pair discover that they passed and Stone informs them that they would've failed had they not gotten extra credit for working through a monster attack. Though the pair are initially happy, their moods quickly drop as they realize the attack was real and they could've died, causing them to pass out into their big Ice Cream Sundaes. In the Power Chamber, the Zeo Rangers receive a message from Billy on Aquitar, who is his normal age again. The Rangers ask when he's coming home, but Billy explains that he intends to stay on Aquitar with Cestria, feeling that it's the place where he belongs.