Based on The Pulp Friction. The Family of Loud's and their friend Clyde protects Royal Woods from criminals and supervillains.

After Mega Cat defeated Dr. Simian, a new enemy arrived in Elmore to cause chaos. Who is she and why is she doing this? Find out in this story.

Several months after Dr. Simian's defeat, a fast colorful Robot Master named Tobias attacks Watterson Labs. He challenges Mega Cat to take out Dr. Simian's eight new Robot Masters. If he refuses, the city will be destroyed.

2 weeks before the events of Mega Cat, Dr. Nicole Watterson tells Gumball about Lexy, his long lost sister and a robot created prior to Mega Cat and Anais.

In the year 20XX, Dr. Nicole Watterson created 6 powerful robots that will help the world. However, Dr. Simian wants the robots for her own purpose, she reprogram them and used them to conquered the world. When the city is under attack Gumball, Nicole's son, offers to go and fight Dr. Simian and the robot masters as' "Mega Cat."

Two mysterious robots awaken Tobias and the ten Robot Masters. When they heard that there creator was arrested, they want revenge, so the two robots send them to kidnap Mega Cat's friends and family. Can Mega Cat and his brothers save them and stop those mysterious robots? Let's find out.

Dr. Simian escape, and the Fifth Robot Rebellion is inevitable. But when it finally comes, its source is not Simian, but one whom Mega Cat had thought she would never have to fight again... his twin sister, Lexy...

Ice Man want's make a perfect gift for Roll but he doesn't know if it's perfect. But luckily Cut Man show up and help him out. Will this gift surprised Roll? let's find out.

When Dr. Simian disappeared for a year, the world is final at peace. Until a mysterious scientist named Dr. Brown and his eight "Robot Masters" starts raging havoc to the city. Fearing the worst, Dr. Watterson sends Mega Cat, Darwin and his new brother Mega-Dan to save the world once again.