Mxyzptlk's Revenge: A doorway appears inside the Hall of Justice. Superman and Batman wonder where it originated from and where it leads. Then the voice of Mxyzptlk is heard and Superman realizes who's responsible. The door opens up, sucking everything inside, including Batman and Superman.

Warpland: Superman and Batman are pulled into a space warp where they come across a strange planet inhabited by aliens known as Zoons. Two Gleeks Are Deadlier Than One: Wonder Woman and Green Lantern think the Legion of Doom will strike since the entire Justice League is going to meet in the Hall of Justice the next day. Jayna and Zan are put in charge of security during the night. Giganta sets a trap and captures Gleek with bananas and takes him to Gorillia Grodd. A mechanical duplicate of Gleek arrives at the Hall of Justice to use his killer laser eyes on the Justice League and help Grodd and Giganta take over the Hall of Justice. Bulgor the Behemoth: A writer turns into the creature he created after a lightning bolt electrocutes an electrical tower nearby. Apache Chief and Superman are on hand to stop the behemoth from continuing his destructive ways.

The Krypton Syndrome: Superman travels through a time warp and is taken back to the hours leading up to Krypton's explosion. He saves the planet by stopping the solar flares using the Super-Mobile core and then returns to the present to find Earth a very different place. Robin confronts him and has no idea who Superman is and then remarks that the Justice League was defeated by the Legion of Doom, he is the only one alive. He soon realizes that by saving Krypton that it erased his time on Earth and that nobody had ever heard of Superman before. Invasion of the Space Dolls: Space dolls try to take over the world but run out of batteries.

Revenge of Doom: Batman and Robin foil some building constructors' plans to revive a destroyed Hall of Doom and turn it into a Museum. When Batman figures something is wrong, the building constructors reveal themselves to be Lex Luthor, Soloman Grundy, Sinestro and the rest of the Legion of Doom.

Return of the Phantoms: The three Phantom Zone villains: Logar, Hol, and Romlok are freed by an alien who doesn't realize they are criminals. In this episode they force the alien to travel back in time with them in an attempt to alter Superboy's life—hoping that he will never grow up to become Superman. Meanwhile, in the future, Superman and Green Lantern learn of the plot from the alien and travel back in time to save Superman's own past and capture the Phantom Zone villains.

Prisoners of Sleep: While investigating a strange electrified spiked metal pod, Superman and Batman unwittingly unleash the cloud-like prisoner inside (named Sleep), and are then trapped in a dream world.

Attack of the Cats: Batman, Robin, and El Dorado investigate a series of crimes which lead them to the conclusion that the culprits are not human.

Playground of Doom: Giant children arrive on Earth and create destruction all over the city. A call to the children's home planet and a visit from some influential individuals put a stop to the children's pranks.