Originally a blank-faced alien with the ability to take possession based on whatever doll it gained the form of, it becomes "Kaijurugin" by possessing a monster puppet used by Ken and several children as part of a show using their "Five-kun Dolls", making the grudge of the puppet become its own grudge. Once formed, it possesses all of the puppets for the show (both the Five-kun Dolls and Garoa-kun) in order to have Fiveman become hurt whenever their puppet is attacked during the show performed by Ginga Sentai Gingaman. Realizing the Five-kun Dolls were only associated with Fiveman, Ken changes back to his civilian guise and uses it to defeat Kaijurugin's curse. Fiveman quickly defeat it with the Earth Cannon; when Dongoros uses Gorlin #19 to make it grow, they defeat it with ease with Supe