 After Altaira tells Morbius that she intends to leave with Adams, Robby detects the creature approaching.Morbius commands the robot to kill it, but Robby knows it is a creation of Morbius's subconscious mind and shuts down rather than harm him to stop it.The monster melts through the almost indestructible Krell metal doors of the laboratory where Adams, Altaira, and Morbius have taken refuge.