A shape-shifting demon takes on the appearance of a little girl to cause discord in the Getta team, taking advantage of Benkei's naivety. Nottetempo Genki discovers the girl's plot but the demon hypnotizes the boy to prevent him from revealing the truth. The next day the Mega Demon arrives, piloted by the shape-shifting demon and the boys, disunited and disorganized as never before, come out to defend the laboratory. The disorganization puts the team in difficulty but genki, having recovered his senses, warns Benkei of the incident and once the harmony between the members is back, the Getta Robot can be reconstituted which soon defeats the enemy.