Superman destroys them... wtf... are you kidding me?
Maybe etrigan... or blue beetle... or booster gold would be a good fight.. but to say GR and DK pose any challenge to superman is like saying luke cage would beat a fully enraged hulk in an arm wrestling match.
__________________ Quotes from Hia8:
"I claimed that the science is sometimes faulty."
"You don't understand. This is fiction. That means none of this stuff really happened."
"There is no writer to purposely ignore a character's natural ability just because it suits the story."
"in some cases because the writer knows that Character A will dominate Character B easily and refuses to allow this to happen for the sake of the story."