Talk:Mystery Key/@comment-70.180.198.108-20151025231059

Mettaton is a spectre- a type of non-corporeal monster- who temporarily inhabited the robotic body of his first form to help Alphys become Royal Scientist, a position from which she would have the resources to create the body she showed Mettaton as a ghost- Mettaton EX.

Several Hotland NPCs comment that Alphys became Royal Scientist after she created "a robot with a soul", and Mettaton's diaries reveal that it was indeed a hoax, as he was not an artificial intelligence but a ghost.