Mister Amazing is a superhero comic book series sold at The Android's Dungeon & Baseball Card Shop.
Mister Amazing can be seen on a rack of comics when Bart and Milhouse are discussing the differences between Radioactive Man and Radiation Dude.
The cover has an image of a man wearing a green mask with a pink and yellow lightning bolt design on the top, and two feather-like protrusions on either side of the mask.
 Behind the Laughter
The name of the comic is likely a reference to the Marvel Comics character Mr. Fantastic of the Fantastic Four. However, the character on the cover of the comic bears no resemblance to Mr. Fantastic.