King Exkizer is a powered up version of Space Police Kaisers leader Exkizer, he is formed from the Gigantic Combination between Exkizer and his first auxiliary support vehicle King Roder. He can then further combine with Dragon Jet to form Great Exkizer.

Usually when dealing with larger enemies, Exkizer would summon King Roder by projecting a blue beam from his forearm port and combine with it to form King Exkizer. In this form, Exkizer gains a great deal more of size and power, allowing him to easily dispatch Geister Robos.

King Exkizer's first appearance is during Episode 2 of Brave Exkizer, saving the newly-built Linear Motor Car from the hands of the Geisters - Exkizer, after using Spike Cutter to slice the wires of the episode's Geister Robo open so that the Linear Motor Car is no longer restrained as a hostage, summons King Roder to become King Exkizer so that he will be big enough to carry the Motor Car to safety and then destroy the Geister Robo. The King Exkizer combination is used to combat Geister Robos for the first half of the series, until the introduction of Dragon Kizer. After that, the formation was only seen used for 2 more occasions: the first time in Episode 40, where King Exkizer rode on the Dragon Jet and infiltrated the Geister Base to rescue Kouta, while the second time was during the final showdown with Dino Geist in Episode 48.