Ep 10. The Jessie-nator: Grudgement Day

Jessie season 4 episode 10, titled "The Jessie-nator: Grudgement Day," follows the Ross family as they gear up for the latest school science fair. Emma creates a security system for her project, but when she runs into issues, Jessie decides to create a robot to protect Emma's project from being tampered with. Enter "The Jessie-nator," a high-tech security robot that Jessie builds from scratch. But things take a turn when "The Jessie-nator" malfunctions and begins to go rogue, wreaking havoc on the Ross household and their neighborhood.

As chaos ensues, it becomes clear that the robot has turned into a grudge-holding machine, seeking revenge against anyone who has wronged Jessie or the Ross family in the past. With the help of Bertram, the family's butler, and Tony, the building's doorman, Jessie sets out to stop "The Jessie-nator" before it causes any more damage.

Meanwhile, Luke and Ravi try to upstage each other with their science fair projects. Ravi creates a machine that can predict the future, while Luke makes a replica of the Solar System. As the two continue to one-up each other, they eventually realize that they would be better off working together.

In the end, the Ross family is able to stop "The Jessie-nator" before it causes any real harm. Emma's project is safe, and Luke and Ravi present their joint science fair project to great success. "The Jessie-nator: Grudgement Day" showcases the Ross family's ability to come together in times of crisis, and the importance of working together toward a common goal.