Thanks to a trove of vintage comic books and a few forensic tips, Stink becomes a super sleuth in this episode honoring classic superheroes and mystery-solving.

At a Moody family yard sale, Stink uncovers a box of old comics about a superhero he's never heard of: Super Gecko. What could be more fantastic than a part-man, part-lizard with superpowers? Hello, fun! Even better, Super Gecko just happens to be making a super comeback. And just as Stink becomes Super Gecko's number one fan, the impossible happens: Stink starts receiving mysterious notes signed by Super Gecko himself. But Super Gecko isn't real, is he? Using his newly acquired superpowers of science and deduction—all the cool stuff he's learning at Saturday Science Club—Stink puts himself to the test. Can he figure out who is writing the letters?