Rat King

A mysterious and unsettling presence in the world of the Teenage Mutant Ninja Turtles, Rat King crawled out of the Copper/Modern Age in 1990, introduced by Dean Clarrain and Jim Lawson in Teenage Mutant Ninja Turtles Adventures #11 from Archie Comics. His appearances put him squarely in the orbit of Raphael, Leonardo, Michelangelo, Donatello, and Splinter — some of the most beloved characters in comics. A rare and elusive figure with only a handful of catalog appearances, he's the kind of deep-cut antagonist that dedicated TMNT fans love to hunt down.