The Ice Cream Monster was a giant ice cream-comprised beast made of vanilla, strawberry and chocolate sent by the Delightful Children From Down the Lane against Sector V of the KND (Kids Next Door).
First, it stomped over Numbuh 2, covering him. Then he nailed Numbuh 1 into the wall with ice cream cones before spitting cream (and a cherry) over Numbuh 5. Finally he fudged Numbuh 4 in a tank of chocolate. It was melted by Numbuh 3 when she set the Tasty Taste Ice Cream Factory heater to "Like, eleventy billion degrees". The wave of melted ice cream destroyed the factory, dragging everyone with it.
- This creature's physical appearance is a parody of the evil king Bowser from the Super Mario Bros. videogame series.