We start off with the Teen Titans viewing the monitor for criminal activity. At some point, the UGRV crashes in through the kitchen and says "Good Morning". Robin asks who he is, and he says "I'm your Uncle Grandpa". Beast Boy wonders what that means, and Belly Bag says he's not just their Uncle Grandpa, he's everyone in the world's Uncle Grandpa, "and when he comes to visit, you're sure to have a fun time". Robin says it's nice to meet him, but he and the Titans have more important things to worry about, and Uncle Grandpa offers his services. Robin thanks him for the offer, but says they can handle it. Uncle Grandpa says that he loves helping people, and Cyborg says he can help. Just then, the crime alert goes off, and reports that Killer Moth has unleashed an army of mutant moths on Jump City. Robin says "TITANS GO!" and the Titans go to action, with Uncle Grandpa joining them. In Jump City, the Teen Titans and Uncle Grandpa face the mutant moths, with Uncle Grandpa asking Belly Bag for his laser hammer. Uncle Grandpa manages to take down several moths with the hammer, and the Teen Titans are about to win the day when Killer Moth arrives, riding a giant moth, which knocks out and captures the Titans and Uncle Grandpa. Later, the Titans and Uncle Grandpa find themselves locked in a moth shaped cahe dangling over a pit of lava. Robin blames Uncle Grandpa for getting the Titans in this situation. Uncle Grandpa apologizes, but Robin doesn't accept it, saying "sorry won't cut it". Just then, Giant Realistic Flying Tiger crashes in and frees Uncle Grandpa and the Titans, who fight Killer Moth, who says they'll never be able to stop him. Just then, Giant Realistic Flying Tiger pushes Killer Moth into the lava pit, burning him alive, and Robin apologizes to Uncle Grandpa for doubting him, and declares him an Honorary Titan. Uncle Grandpa bids them farewell as he goes through his checklist of superheroes to help as he makes his way to The Crimson Chin from The Fairly Oddparents to help.