Monster By Mistake Season 1 Episode 4 Pizza Day

Bizarro - Warren wakes up with a killer cold that has him sneezing and turning into the Monster every five seconds.  Someone at school's sure to see him transform, so Tracy suggests he stay home.  But it's Pizza Day - which means that Warren gets his favorite slice of pepperoni.  He doesn't want to miss that, so Johnny sticks a clothespin on Warren's nose!