The team goes to Gwen's house to find a solution to defeat Compruton's minions from Dimension 12. When they go to Gwen's room, they find a dark-hair girl. Gwen's mom tells them that it's Sunny, Gwen's naughty cousin. They try to leave the house, but Gwen's mom doesn't let them to go if they don't take Sunny with them. The team takes Sunny to the mission but, they left her in Kevin's car. They go to fight the robots. Ben becomes Four Arms. Sunny gets bored in the car, and she follows them. She throws a perfect manna-kick at the robots. Sunny is very happy, but the team is looking at her with strangely. Gwen tells her mom that Sunny is an Anodite and she tells her that she knows it. Then, a big monster knocks on the door. It is Antonio, Sunny's boyfriend. Gwen tries to stop Sunny from going with him, but she doesn't succeed. The team goes to defeat the robots, which have returned. During the fight, Sunny comes to have fun. She goes Anodite and she defeats some of the robots. When Gwen tells Sunny that her parents don't want her dating Antonio, a fight starts. Ben becomes Ultimate Humongousaur to fight Antonio. Ben defeats him. Sunny is stronger than Gwen and she hurts her. Gwen calls Grandma Verdona. Verdona comes and takes Sunny and Antonio so thier parents can punish them.