Arguably the best SuperFriends episode of the franchise, "Universe of Evil" finds Batman, Robin, Wonder Woman, and Aquaman heading to a dam that's about to crack open. But when cables are fired into the dam from the Bat Jet and Invisible Jet, they're pulled to help the dam break wide open, creating title waves into near-by villages. We then learn that these are evil SuperFriends, or Super Enemies, in a parallel universe. Soon after, both the evil Superman and our good Superman fly to Mount Vesuvious in their respected universes. The sinister villain attempts to cause the volcano to erupt, while our hero tries to prevent the eruption. The evil Superman succeeds, but the eruption sends each Superman into the opposite universe. While the good Superman is hampered and captured by the Super Enemies and locked away at the Hall of Evil, the evil Superman soon realizes what has happened and attempts to take over the good universe. Our Superman escapes and is aided by a scientist at Metropolis University to return him and his counterpart to their respected universes. He is given a special flask that must be opened at the exact spot he arrived. The good Superman promises the scientist to return to bring justice to the evil universe. But as he leaves the university, the Super Enemies attack him again. Just as he's about to be killed by kryptonite lasers--at the same time the SuperFriends are about to surrender to the evil Superman in our universe--the good Superman opens the flask, and all is returned to normal.