The Plan For Defeat (侵略者撃破計画 改造怪獣ギランダー登場 Shinryaku-sha Gekiha Keikaku Kaizō Kaijū Girandā Tōjō lit. Operation of Defeating Invaders: Customize Monster Giranda is Coming) is the 47th episode of Mirrorman.
The members of the new weapon development group were murdered one after another. What was worse, the monster captured Yuki, who was being transferred from SGM to the group. The invaders threatened SGM to kill Yuki unless SGM delivered then the laser power unit that was just before completion. The unit was the main part of the Challenge Project. The invaders got the unit and installed it in the body of the monster that was beaten by Mirrorman.