You will not find pizza parties or exploding "Cowabunga!" word bubbles in the original Teenage Mutant Ninja Turtles comic. Instead, the Turtles' early adventures are loaded with swearing and extreme violence.
The first appearance of the Teenage Mutant Ninja Turtles came in 1983 when a mutated rat sent his adopted mutant turtles on a vengeful killing rampage to take down the Shredder, who they successfully slew before moving on to bigger and badder foes.
These days, the Heroes in a Half Shell are ubiquitous - as are a slew of TMNT ripoffs - but younger fans may be surprised to learn the crew's dark origins. While the concept has always been a little goofy, the hilarious jokes and good-natured comradery are newer additions to the franchise.