Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Promethium is the name used for two different fictional substances; one from the DC Comics universe and one from the Marvel Comics universe. These should not be confused with promethium, which is an actual chemical element. In DC Comics, promethium was invented and patented by Steve Dayton of Dayton Industries. When alloyed with titanium and vanadium, it forms a near-invulnerable metal. The bionic and cybernetic components of Vic Stone (better known as Cyborg) are made out of depleted promethium, and Red Arrow of the Justice League wears a bodysuit that combines both depleted promethium and Kevlar; Deathstroke the Terminator's mesh armor, sword and staff are made (either wholly or in part) of depleted promethium. Promethium is also capable of generating near-limitless amounts of energy, and so can be used as a power source for many gadgets.

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