The Monsters learn the value of teamwork when they are sent to the store for milk. One wants to be in charge, Six falls asleep on the departing bus, Four tries to stage a mutiny and Seven loses his head. But, in the end, they pull together and bring home a cow!

It is bedtime and the monsters will not listen to their Mum and go to sleep. Pillow fights, conga lines and even a mosquito hunt are among their antics. However, when Mum reads them a fairy tale they tumble off to sleep.

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.

When Mum takes a nap, a neighbour leaves her baby with Seven to take care of until she returns. The Monsters quickly find out that babysitting is harder than it looks when the baby turns the house and the Monsters upside down.

One and Six have different ideas of how to stage their Mother’s Day Party. Tempers flare and One suggests that if Six can’t go along with her plan, maybe she’d be happier with another family. Six goes off in search of a “new” family, winding up as the star attraction at the circus.

There is nothing worse than having to be patient for a special package in Two’s mind. He waits and waits while the other Monsters are having fun. Trying to be helpful, Seven searches for the package only to lose his head at the Post Office. The head travels the globe, but gets back home just in time to deliver Two’s package.