Radioactive Man. He can do everything CA can but CA's power's just come from his shell/armor. Radioactive Man is also much stronger as he went toe-to-toe with Namor and held his own.
DRA
Draco69Snarky Slytherin
This is completely inaccurate. That was OLD Captain Atom. From like fifty years ago. Current Captain Atom has complete control over the electromagnetic spectrum and has access to nearly any type of energy he wants,