Doctor Franklin Hall
Franklin Hall was a genius scientist who worked for S.H.I.E.L.D. and Nick Fury. An accident at his labs gave him the power to control gravity fields, and because of the danger he represented, he was put into coma and imprisoned in the super-human prison Raft.
Many years later, during a massive breakouts from the Raft and other prisons, Graviton woke up and wanted to get revenge on Fury. The combined efforts of Iron Man, Thor, Doctor Strange, Wasp and Scarlet Witch managed to stop Graviton, who was put in custody by S.H.I.E.L.D. again, while the heroes who defeated him formed a team called The Avengers.