A "life-saving innertube" monster created by Lord Zedd from Bulk and Skull's innertube that resembles a blue-and-white-painted Pipebrain. Tube Monster begins causing havoc in the city when a battle is being fought between the Rangers and Goo Fish, Pirantishead, Slippery Shark, and Commander Crayfish. The rest of the Rangers go into battle against the giant Tube Monster, while White Ranger remains behind to battle the other aquatic monsters. Tube Monster doesn't pose much of a challenge against the Thunder Megazord, quickly being defeated by the Thunder Saber. After the Tube Monster's defeat, the tube is returned to the beach, where it had originally been.