This is a crossover of the amazing world of gumball. Gumball helps Steven stop rob from stealing Steven's new cookie cat box.
The episode starts with the Big Donut. For Steven's birthday, Sadie mailed the creators of Cookie Cat to make Steven a box filled with 900 Cookie Cats. Then Steven wakes up for his birthday. Garnet makes Cookie Cat shaped pancakes and tells Steven to go to the Big Donut after breakfast. he finishes breakfast and walks to Big Donut. He sees a box and asks Sadie if he should open it or not. She says yes, so Steven opens it. It has ALOT of Cookie Cat packits.