The ATOM is a diminutive superhero who first appeared in the DC Comics universe in the 1960s. He was created by editor Julius Schwartz, writer Gardner Fox, and artist Gil Kane. The ATOM has the ability to shrink himself down to subatomic size, allowing him to enter other dimensions and travel through time.' The ATOM is a four-letter diminutive superhero who first appeared in the DC Comics universe in the 1960s. He was created by editor Julius Schwartz, writer Gardner Fox, and artist Gil Kane. The ATOM has the ability to shrink himself down to subatomic size, allowing him to enter other dimensions and travel through time. This power gives him the potential to explore the universe and gain knowledge that would otherwise be inaccessible.