they fury is an android created by mad jim jaspers(mutant version of molecule man) that can grow organs at will to counteract any super powered being he came across, no matter how powerful they were and ultimately defeated them. in fact, jaspers pushed for a mutant reg. act of sorts in his native england and it passed so he created the fury to hunt and kill all supers....which it did.
the fury was frustrated cuz it was programmed to kill everyone with powers except jaspers himself but when jaspers own universe was destroyed the fury grew some organs that enabled interdimensional travel and ended up in 616, where it met a few heroes and destroyed a handful of them..when he met the 616 counterpart to his jim jaspers the programming didnt prevent him from killing him so he took him on, and they battled endlessly across diff. realites and dimensions til he finally killed jim...(tho this was a slighlty powered down version of the jaspers from his unverse)....so yeah this dude is the orginal amazo times ten..doomsday doesnt stand a chance
first cap britain isnt a weakling, and secondly he only killed him cuz he was severly damaged from his battle with jaspers and hadnt enuff time to recover, then Capt. britain and Capt. UK both ganged up on him.. as far as feats oh gee i dont know how about killing every super powered being in a reality and merlyn...yes that merlyn
well jim jaspers was a mutant that could warp reality on a cosmic scale, hence my referring to him as the mutant version of molecule man...gog is just a nobody with a fancy glow stick dude..the fact that you had to ask who the fury is pretty much tells that he's way before your time. he can analyze any superhuman, and instantly evolve a counter offensive, no matter who they are so gog and superman would be nothing to him