The Mystery of the Missing Five

S1, E3: Moody Four has to always look after his twin brother Five. But, when Five’s behaviour includes eating Four’s favourite toothpaste and polishing his ankles with Four’s favourite toothbrush, Four does the unthinkable and blurts out that he wishes Five had never been born. When Five seemingly disappears, the Monsters think that Five has gone to the hospital to “Give himself back!" The hunt is on and Four learns that a pesky Five is better than no Five at all.