This YouTube medley features Rainbow Brite cereal (why did RB wear epaulets? was she in the British Navy?), Cap'n Crunch Peanut Butter cereal (yeah, it's part of a balanced breakfast if the rest of your breakfast is broccoli), Cookie Crisp (with the Cookie Crook!), Crispy Critters (this looks like animal crackers to me), a hellishly screechy cereal for a Cocoa Pebbles variant called Dino Pebbles, Marshmallow Krispies, Sugar Smacks (back when it was OK to use "Sugar" in a cereal name), and "Breakfast Bears," which appears to be just Teddy Grahams in a bowl.
What cavity-causing cereal did you eat as a kid? My mom bought Kaboom (remember the clown?) and I think she thought King Vitaman was some kind of compromise between sugary cereal and bran, so she bought a lot of that.