A new kid joins Springfield Elementry School called Brad. He starts to hang out with Bart amd then suddenly replaces Milhouse and becomes Bart's best friend. Then, overvtime, Brad copies Bart into the things he does and looks like as he wears the same clothes like him, does the same hairstyle amd rides the skateboard. Soon, everyone starts to get confused thinking whos Brad and whose Bart. Seeing this, Bart gets angry. The next day, Bart starts spying Brad to where he goes and what he does. He attaches a GPS on Brads car after soon learning Brad can drive. He follows him all the way to his house and when he secretly goes into his house, he discovers evrything there is really small. Brad then finds Bart in his house and points a gun at him. Bart hits him on the head with a shovel and calls the police. Whilst taking Brad away by the cops, Bart learns Brads true identity. When he goes to prison, Brad shares the same prison cell as Sideshow Bob.