Dark clouds blow in, bringing Thunder and Lightning, two stormy brothers looking for a good time. Unfortunately, their idea of fun is wrecking everything in sight. Meanwhile, after one of Beast Boy's practical jokes on Starfire misfires, Beast Boy learns his lesson after realizing that, just like the brothers, there are penalties when you don't think of others. He starts to get through to one of the brothers, Thunder, but the mysterious Slade disguised as a Chinese sorcerer shows up and tricks the brothers into unleashing a fire demon. Beast Boy gets through to Thunder, who gets through to his brother - the two team up to summon a thunderstorm and put out the demon while Slade escapes.