At the end of her long quest through the Chozodia temple and the Space Pirate Mothership, Samus eventually stumbles upon a supposedly deactivated Mecha Ridley. However, suddenly, all exits to the room are locked and Mecha Ridley springs to life, triggering a conflict between the two and the final boss battle of the game. Through the heavy weaponry of missiles and super missiles, Samus eventually defeats and destroys Mecha Ridley. However, as a last resort, the machine tries to take Samus with it by setting a self-destruction timer for the Mothership, but Samus flees just in time.