alliator
Alliator is a fictional element appearing in Marvel Comics. It is a highly unstable, radioactive element with no known practical applications. First introduced in the comic book "Fantastic Four" #293, alliator was created by the villainous scientist Doctor Doom. He sought to use the element's volatile properties in a weapon designed to destabilize the Negative Zone, a dimension of pure antimatter.
The discovery and subsequent use of alliator were central to the storyline involving the Fantastic Four's efforts