I don't know about the speed of Captain Atom being all that. Banshee is listed as being able to move at the speed of sound, and here is a scan showing that Captain Atom has to really push himself to outrun a bomb blast.... Yeah, but that can be chalked up to the standard inconsistency all characters seem to face at one point or another in reagrds to their powers. I could (if the site were still up) show a few scans of him approaching the speed of light. He was somehow teleported into the middle of nowhere in outer space, and, in another example of inconsistency, he couldn't breathe in outer space. Holding his breath the entire time, he figured out which direction he needed to go in and raced back to Earth. He drew from the Quantum Field and kept pushing himself faster and faster and made it back before he died out there. Pretty cool scene, actually. EDIT: Never said it was blowout. That was one scenario. There are others, methinks.