Mr. Mxyzptlk and the Magic Lamp

After stealing a magic lamp, an otherwise idiotic thief known as Benny the bungler is confronted by what he believes to be a genie. In reality, it is Mr. Mxyzptlk, and he grants Benny the power to commit super crimes. With the Super Friends clueless as to how a simple thief is committing these crimes, they have to find a way to stop him, and deal with the even more powerful Mxyzptlk as well.