Creatures bio-engineered by Dr. Viper and used to take over Megakat Tower. They came in several varieties and sizes, including static, ground mobile and air-mobile versions, all capable of spitting corrosive acid. All of them were immune to conventional weapons, including projectile, flame, chemical and electrical based attacks, though they were susceptible to extremely low temperatures and could be frozen and made brittle. All Plantimals were destroyed when the SWAT Kats dropped a large canister of rocket coolant on the building. Later, Dr. Viper used a half kat, half mushroom Plantimal as his assistant during his attempt to steal Katalyst 100, and during his alliance with Dark Kat and the Metallikats.