SMASH artist Kyle Bolton has been feeling a tad nostalgic lately. Here are his sketch tributes to the beloved Teenage Mutant Ninja Turtles. Can you guess which is which?

Athough they're better known for their movies and TV cartoon series, Kyle and I are longtime fans of the old-school Ninja Turtles comics. Waaaaaaaaay back in the 1980s, we used to collect the original black-and-white TMNT comic series that was nothing like the silly, light-hearted tone of the TV or movie versions.

When we were kids, we thought the Ninja Turtles comics were gritty and hardcore. Only years later did we learn they were intended as a tongue-in-cheek spoof of beloved comic series by Frank Miller, especially RONIN and his ninja-heavy DAREDEVIL issues.