A giant Lord Zedd and his family reign blow upon blow to several buildings and Harbours and endangering lives at their leisure as they make their way to and through Angel Grove. But before they can destroy the city for good, Master Vile reduces them to their original size and lectures the evil team on nearly ruining his plans. Zedd insults Vile and he teleports them back to the Moon Palace, ending thier reign of terror for now, Vile announces that he is holding a Monster Conference, monsters from several planets will attend to destroy the Earth itself. Finally reunited with Zordon and Alpha, the Rangers ask if the Earth can be restored, Zordon says it is possible, but for now there are bigger concerns, Alpha suggests that Zordon summon the Alien Rangers from the Planet Aquitar to defend the Earth

At the Command Center, the Kid Rangers and Alpha are able to contact the Alien Rangers. Their leader, Delphine, agrees to help out Zordon despite great risk to her Rangers' well being, due to their being water-based creatures.

At the Command Center, Billy is working on a device which, when powered by the Ranger's Power Coins, will reverse the effects of the Orb of Doom's time-alterations on whoever is bathed in it's energy, this will restore the Rangers to normalacy, meanwhile, at The Moon Palace, Lord Zedd and Rita, back in charge once more with the departure of Master Vile, scheme to defeat the Rangers for good, and the only way to do that is to destroy their Power Coins.

At the park, Billy is working on a Hydro-Atmospheric Generator in hoipes of duplicating the natural water of the Planet Aquitar, therfore allowing the Aquitian Rangers to remain on Earth without abandoning it for re-hydration purposes. The Aquitians, however, are already weakening, and Billy has to test out the Generator quickly, he and the kid Rangers help the Aquitians to the Angel Grove Lake. The Aquitians enter the lake, but suddenly, Goldar and Rito attack with the Barbaric Brothers, who contaminate the water, Rito then uses a remote controll device to trap the Aquitians in a forcefield to prevent them escaping from the lake as it becomes awash in poison. The Kid Rangers are able to gain control of Rito's device by tricking him with a game of tag, wthe Aquitians are released, and they defeat the Barbaric Brothers in a lengthy battle, when thry grow, the Aquitians use the Battle Borgs and the Shogun Megazord. Lord Zedd is defeated for now, but with the Hydro-Atmospheric Generator destroyed earlier, the Aquitians are forced to return to Aquitar for a full re-hydration, leaving the Earth more vulnerable than ever... TO BE CONTINUED

The Kid Rangers decide to have some fun at the Angel Grove Splash City Water Park, but find thier happiness spoiled by Bulk and Skull's mischevous pranks. Meanwhile, Rita and Lord Zedd send Rito and Goldar into the subterranean tunnels underneath the Command Centre, their goal is to set up an implosive device at the end of the tunnel which will reduce the structure to rubble, unfourtuantly, the two bumblers lose the map...and themselves Lord Zedd transforms Bulk into a monster, Brat Boy, and deploys him to attack the Rangers whilst the Aquitians are off-planet, when the Aquitians return, fully re-hyrdated, they defeat Brat Boy, but he grows to an incredible size, the Aquitians battle him in the Battle Borgs. The Kid Rangers appeal to Brat Boy's human side, reminding him he DOES have freinds (or at least one freind in Skull) Brat Boy resists Lord Zedd's mind control and returns to normal. Back at the Command Centre, Zordon tells the Rangers that the only way to restore thier powers and the world to it's present time is the Zeo Crystal, divided into different sub-sections across time, the Rangers must travel through the ages to locate each segment if they hope to defeat their enemies and save this world...

Billy and the Aquitians say goodbye to the Kid Rangers as they jump into a time hole to begin their search for the missing sub-sections of the Zeo Crystal. Cestro begins to weaken from lack of water, and the Aquitians communicate with local aquatic lifeforms to locate a source to replenish their comrade, whilst Lord Zedd calls in an old freind, Witchblade, to ambush Cestro whilst he is defensless, he also generates a forefeild around the Earth to prevent the Aquitians from summoning the Battle Borgs from Aquitar.

Billy seeks out a device he'll need to combine the Zeo Crystal sub-pieces, and ends up webbed-up by Arachnofiend. Meanwhile, Adam journeys to Korea at some point in the past in search of his Zeo Crystal, he seeks out an ancient wiseman known as Kai-Ogi for guidance, but all he runs into is oblivious people and a persistantly annoying old man! Also, the Aquitians discover the joys of walking through a car wash.

Katherine and Tommy each try to retreive thier Zeo sub-crystals, Katherine's good heart is tested by people who look like future versions of herself, and Tommy learns of his Native American heritage from a wise old man called True of Heart, meanwhile, the Aquitians attempt to prevent Lord Zedd and Rita from summoning their sworn enemy, the Hydro Hog, to Earth...

Lord Zedd and Rita succeed in bringing the Hydro Hog to Earth and the Aquitians are soon brought to their knees as he begins draining all the water on the planet! Meanwhile, Aisha arrives in Africa searching for the final sub-segment of the Zeo Crystal. On her journey she meets a young girl called Tanya and learns of a crippling famine affecting the land.

The Kid Rangers are able to revive the weakened Aquitians. Meanwhile in Africa, Aisha learns that her Zeo sub-crystal is in the possession of Tanya's tribe and that it was foretold that she would arrive to help fight the famine problems affecting the village. As the Zeo quests conclude, so do Rita and Lord Zedd's plans to destroy the Command Center. The Rangers' lives are about to be changed forever...