in Simpsons Comics Unchained (HarperCollins, 2001 series) #[nn] (2001), #[nn] (2001) [cover]The cover is also signed by Simpsons creator Matt Groening, although it's doubtful he contributed to the art.
This flip cover is based on (acknowledged) Jim Steranko's cover for Captain America (Marvel, 1968 series) #111 (March 1969). Simpsons creator Matt Groening's signature also appears on the cover, but it's doubtful he contributed to the art.
The story continues in Simpsons Comics 37