Marie Curie
Marie Curie is a time-travelling superhero.
She and her beloved husband Pierre invented the world's first successful wife-and-husband superhero team.
In their fused-identity state, Marie and Pierre form Super-Curie.
Theoretically, Pierre and Marie could form Curie-Super, but this has never been attempted.
The Curies researched experimental time-travel drugs in an effort to prevent the Green War.
The radium-based drugs failed to cross temporal thresholds.
In desperation, the Curies finally exposed themselves to pure Extract of Radium, sharing an entire bottle in a solemn ritual of self-sacrifice.
No one was more surprised then the Curies themselves when Marie and Pierre merged to form Super-Curie.
Super-Curie is widely credited for saving all humanity during the Green War.