Ep 4. The Alien Trap

Billy works on a device to purify Angel Grove Lake so the Aliens can hydrate. Zedd and Rita send Erik and Merrick, the Barbaric Brothers, to toxify the water. Rito places a force field around the Aliens, trapping them in the toxic water. Later, the kids are able to trick Rito and they break the force field, freeing the Aliens. Zedd and Rita unleash the Barbaric Brothers on the city. The Aliens use the Battle Borgs and the Shogun Megazord to defeat the monsters. The Aliens return to Aquitar to rehydrate.