Ralph Hardy was on an archaeological dig in Peru when a
giant serpent burst forth from the ground and began terrorizing the
area. Hardy fled into a ruined temple and found a series of cave
drawings depicting the ancient Incas battling the same monster and a
mystical belt with an inscription reading "He who loves the animal
kingdom may wear this belt and be transformed into a human jaguar."
Ralph Hardy put on the belt and became the Jaguar.