The Zaat, also known as Dr. Z appeared in the 1971 movie of the same name aka Attack of the Swamp Creatures. The Zaat monster was a former Nazi scientist, Dr. Kurt Leopold, who lived alone for about 20 years. He contemplates his former colleagues' derision for his "formula", which is described as "ZaAt" (read Z-sub-A, A-sub-T, but which he simply calls "Zaat"). This compound, it is later explained, can transform humans into sea creature hybrids and "mutate all sea life". He injects himself with the serum and immerses himself in a tank connected to an array of equipment of an unspecified nature, emerging as a furred, fish-like monster named after the serum.