Superman Unlimited #19

SUPERMAN: TRANSFORMED! Look! Up in the sky! It's a bird! It's a plane! It's--oh dear god, what is that thing?! It's got one big eye and three tentacles, and it couldn't possibly be--but it is! That's Superman! Smack dab in the middle of an adventure with his son, Tomorrow Man, Superman finds himself transformed into the strangest alien life-form of all time!