Brainiac, once Krypton’s all-knowing planetary computer, comes to Earth as part of his information-gathering trek across the galaxy, and partners with Lex Luthor on the basis of giving technological progress to humanity. But, as Superman discovers, Brainiac’s intent after gathering the world’s knowledge is to destroy Earth.

Mister Mxyzptlk, returns and tricks Bizarro into attacking Superman. The Man of Steel must use both brawn and intellect to fight the formidable duo.

LexCorp and John Henry Irons design a powerful prototype armor suit for the Metropolis SCU, which Lex hopes will make Superman’s services unneeded. The SCU officer who pilots the suit, Sergeant Mills, proves a useful partner to Superman at first, but the suit soon corrupts the officer’s mind, making him violently unstable. Irons is discouraged […]

Leslie Willis, an obnoxious shock jock and notorious critic of Superman, holds a rock concert during a thunderstorm. When lightning strikes Willis, she is discolored and transformed into the electric-powered supervillainess Livewire. Superman must discover her weakness before she sucks the city dry of electricity.

Gangster Bruno Mannheim is running into problems with the mysterious Toyman, who uses children’s toys and games to cause violence. After being abducted by Toyman, Lois learns his motivation — his father had taken a loan from Mannheim and been set up to take the fall when the police busted one of Mannheim’s criminal enterprises.

An amnesiac Metallo reemerges from the ocean and washes ashore on a volcanic island. Two children find him and make him their friend. As Metallo gradually remembers more of his past, he becomes evil again and seeks revenge on Superman.