Four more episodes from the popular animated series. In the title episode, Superman (voice of Timothy Daly) foils a gem heist at a new museum funded by Metropolis' mastermind criminal Lex Luthor (Clancy Brown), but mysteriously falls ill when he comes near one of their rare green gems. Luthor figures out that this rare rock is really a meteorite from Superman's home planet Krypton. But Lois Lane (Dan Delany) proves that it doesn't take super-powers to ruin Luthor's plans. In 'Speed Demons', Superman and super-cocky Flash (Charlie Schlatter) decide to race one-on-one to settle who's the fastest man on the planet, but the contest is interrupted by when a mysterious villain called Weather Wizard (Miguel Ferrer) threatens to destroy Metropolis unless his demands are met. In 'The Late Mr Kent', Clark Kent digs into a murder case a little too deep and is presumed dead. Finally, in 'When There's Smoke', Superman takes on Volcana (Peri Gilpin), a woman with fiery powers.