From the introduction: ~Super Hero Getter~ Dekaranger , galactic police The universe has come together, aliens from across the stars living in peace with one another. The Special Police Dekaranger serve to protect the many worlds, and a man named Banban Akaza has recently transferred to the Earth branch of the SPD in the city of Megalopolis. A major outbreak of crimes has struck Megalopolis, the work of a group of aliens known as the Alienizers. Agent Abrella, an arms dealer known for instigating wars, has turned his attentions towards Earth. It is up to the Special Investigation Squadron Dekaranger to save the Earth.