When Miss Simian sees Gumball and Darwin joyful on Monday, she knows that something is wrong with them. She performs tests on them, but the nurse disapproves what she's doing. But suddenly, Gumball and Darwin start to infect the school with the 'Joy Virus', and it's up to Miss Simian and her tape player to cure the students.

While driving to a campground, Nicole tells a horror story, which slowly starts to come true as their car breaks down and a stranger comes to help them out.

Mr. Robinson has a stress attack and needs a stuffing transfusion from his son Rocky the janitor. He won't take it unless Rocky gets a better job in life. Rocky gets one with Chanax, where he becomes a work drone. Gumball and Darwin now need to get Rocky's soul back from his boss in order to get him to surgery.

It's Mother's Day and kids put their moms through a series of tests to determine who has the World's Greatest Mom.

Gumball and Darwin are shocked to discover that Anais is Dad's favorite child.

Gumball and Darwin try to figure out the meaning of life after coming down from a sugar rush.

Gumball and Darwin help Anais make up an imaginary friend who turns out to be all too real.