After Billy graduates early, he is needed by Cestro to help the Aquitians with a problem regarding a pollution-based enemy.
Tropes
- A Day in the Limelight: Billy's first focus episode after voluntarily stepping down as a ranger.
- Accidental Hero: Bulk and Skull unknowingly help save all of Aquitar by taking Cestro to Billy.
- Adaptational Nationality: Bara Vanish was an average Monster of the Week that was loyally serving the Machine Empire. Here, the Hydro Contaminators are an entire race onto themselves that threaten the ecosystem of an entire planet. The one we meet apparently has never even heard of the Machine Empire before given his confusion about seeing the Cogs aiding him.
- Badass Normal: Lt. Stone stumbles upon Goldar and Rito and, thinking there's an invasion afoot, chases them all over the park to try to arrest them. Granted, the two are amnesic and not up to no good, but Stone doesn't know that.
- Blind Without 'Em: Billy's vision is near-blank after losing his contacts. Thankfully, he had a pair of his old glasses stashed away just in case.
- Bittersweet Ending: The Hydro Contaminator is destroyed, but Billy has to depart for Aquitar in order to help Cestro's people deal with the larger threat that the Contaminators possess. His friends don’t even get the chance to send him off, leaving them crestfallen.
- The Bus Came Back: Cestro of the Aquitian Rangers returns for this episode. Mr. Caplan also returns after last being seen in “The Sound of Dischordia” in Mighty Morphin' Season Three.
- Composite Character: The Hydro Contaminators' Ohranger counterpart was two separate entities.
- Dope Slap: Bulk does this to Billy. Cestro sees this and, unaware it's not exactly a friendly greeting, ends up knocking Billy's contacts out.
- Happy Ending Override: Shortly after overcoming their longtime foe, Hydro Hog, the Aquitian Rangers were overwhelmed by the Hydro Contaminators and faced poisoned water. According to Cestro, the situation is so severe that their main computer is down and his teammates can't even activate their Battle Borgs.
- I Owe You My Life: Billy doesn't hesitate to help Cestro, what with all the Aquitian Rangers did to help Earth after Master Vile regressed time.
- Lampshade Hanging: As the Rangers engage the Hydro Contaminator halfway into the episode, the scene cuts to the moon.Mondo: What is all this fuss about? Everyone appears to be threatening, and I haven't done a single thing yet.
- Mass "Oh, Crap!": Bulk, Skull, Goldar, and Rito scream the moment that Cestro emerges from his ship. Cestro ends up screaming in response.
- Missed Him by That Much: Doubling back at the ship, Goldar and Rito again get chased off by Lt. Stone. Billy and Cestro teleport back in mere moments later, with the former remaining unaware of Goldar and Rito's continued presence on Earth.
- Nice Job Breaking It, Hero: Cestro's pat on the back causes Billy's contacts to go flying out of his sockets and then Alpha ends up accidentally crushing them with his foot.
- Never Got to Say Goodbye: Tommy and the others miss Billy's departure by a few seconds and are somewhat depressed at the end.
- Non-Action Guy: Cestro does not morph in this episode and when he volunteers to go fight, Tommy shoots him down by saying he is needed to help Billy finish his device.
- One-Steve Limit: Cestro said he needed to find a human named Billy. Bulk and Skull end up taking him to the only Billy that they know and that naturally is the right one.
- Put on a Bus: Billy heads to Aquitar with Cestro to help them in their conflict with the Hydro Contaminators.
- Recognition Failure: Bulk and Skull do not remember Cestro despite meeting him during the Alien Rangers saga, though it’s justified due to no one besides the Rangers retaining their memories of the world while it was under the Orb of Doom's effects. Seemingly the case with Cestro seeing Goldar and Rito just loitering around with Bulk and Skull, as he does not react to them nor does he inform the Earth rangers about it.
- Screw This, I'm Outta Here: Sprocket advocates this after the Rangers destroy the Hydro Contaminator.
- Unusually Uninteresting Sight: Despite having fought with them a couple of times during the Alien Rangers saga, Cestro does not react to seeing Goldar and Rito with Bulk and Skull nor does he inform the Zeo Rangers.
- Wham Episode: Billy graduates from High School early and in the end has to leave to help Cestro and the other Aquitians deal with the Hydro Contaminators.
- Wham Line: "I am Cestro of Aquitar, and I must find a human named Billy. The fate of the world depends on it."
- Xanatos Speed Chess: With the Rangers confronting the Hydro Contaminator, Mondo gladly offers him support.
