One month ago, a strange phenomenon suddenly fused the human world and mobian with the parallel world of Kikaitopia. Despite this, the inhabitants of three worlds, humans, mobians and Kikainoids, quickly got along and live peacefully together.

In the present, however, their lives are threatened by Kikaitopia's evil rulers, the Tojitendo Dynasty, who seek to conquer all parallel worlds. To face this new threat, a brave and energetic young man named Kaito Goshikida inherits the powers of all previous Super Sentai. Transforming into Zenkaizer, he joins forces with the Kikainoids Juran, Gaon, Magine, and Vroon , an energetic hedgehog and Flash sentry to save the multiverse from the Tojitendo and find his missing parents.