After being beaten by the Swat Kats because they were too busy fighting each other, Dark Kat and Dr. Viper decide to team up and unite against their common enemies. They recruit the Metallikats to their cause, forming the Invincible Alliance of Evil, whose only purpose is to kill the Swat Kats once and for all. Kidnapping Mayor Manx and Callie, the villains give the Swat Kats an ultimateum - surrender by sunrise or risk the deaths of the hostages. Can the Swat Kats find a way to rescue Manx and Callie without giving themselves up? And will Commander Feral lend a helping hand?