The Pastmaster returns and sends the Swat Kats through one of his time portals and into Megakat City's future, where Mac and Molly Mange rule a nightmare world of killer robots (called ""Metallitack Units""), confining ""non-metallic creatures"" to slave labor camps, and the vigilantes' friends are rebel freedom-fighters. But the worst part is that the Swat Kats' future selves are dead, killed by the Metallikats when they took over. Now, it's up to the pilots from the past to set things right. But when the older Callie and Mayor Manx are kidnapped by the Metallitack Units, the Swat Kats form an uneasy alliance with the Pastmaster, who wants revenge against Mac and Molly for doublecrossing him. Together with Commander Feral and Felina, they storm Metallikat Headquarters.