Terry Curtis was originally an obscure one-shot Superman character in Action Comics #21 (1940) who was a scientist who was kidnapped by Ultra-Humanite and forced to build an "atomic disintegrator".

Roy Thomas reinvented the character as Cyclotron, a reluctant supervillain, in All-Star Squadron #21 (1983) from DC Comics.

Terry Curtis is an atomic scientist who the Ultra-Humanite kidnaps and experiments on, giving him superhuman abilities.

[1] While battling the All-Star Squadron, Curtis exposes Atom to large amounts of radiation, which eventually gives him superpowers.

[3] The first Cyclotron has immense strength, the ability to fly, project blasts of atomic energy, and manipulate matter on a molecular level.