A really, really cool, strong, or evil bowl of honey-bunches-of-oats. It usually has at least one superpower and generally has a cape. Yair can be considered a supercereal.
"It's a bird, its a plane, no, it's one of those supercereals!!!!"
Katsof is definitely not a supercereal.
My dog was stuck in a cave full of spoons when suddenly, a supercereal saved it.