Rat Frank has only appeared in one episode. In this episode he, RatDubbbz and Jack flip a coin and whoever chose the wrong side had to stick their fingers in a mouse trap. All he wears are sunglasses, boxers and mouse ears. Very little else is known about Rat Frank besides this.
- He is shown to like Bud Light beer
- It is possible that RatFrank has morphing abilities after he turns into a rat resembeling Maxmoefoe