Marvel Comics
In Marvel Comics, promethium is a magical metal found only in Belasco's dimension, known as Otherplace. In Otherplace, it takes the form of a giant animal heart, hidden in a cavern deep below its surface. Removal of the promethium to another dimension will cause Limbo to vanish. The heart of Limbo was once sought by the supervillain Doctor Doom as an inexhaustible energy source for his nation of Latveria. It is currently in the possession of Darkoth.
The Marvel UK cyborg character Death Metal is also made of a magical metal called Promethium; it is not clear if this is the same material or if the name is simply a coincidence.
Read more about this topic: Promethium (comics)
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