Codename: Kids Next Door: Operation Z.E.R.O.

The infamous villains from the Kids Next Door series unite under the leadership of Father, seeking to bring back their long-lost tyrant ruler - Grandfather. Once a powerful figure who controlled the world when most of the villainous team were young children, Grandfather was ultimately disgraced by Father and banished. Now, in an ambitious attempt to regain his former power and destroy the Kids Next Door once and for all, the villains resurrect him from the ashes.However, their plan backfires when they find themselves betrayed by Grandfather, transformed into Senior Citizombies - immortal creatures with the ability to transform any living being into a zombie-like slave. As they serve Grandfather, forced to produce Tapioca to fuel his power, the villains realize they must band together once more to prevent him from destroying the Book of K.N.D., a crucial source of knowledge and strength for their adversaries. In this thrilling journey, loyalties are tested as the villainous team grapples with their dark past and present in an attempt to survive and thwart Grandfather's destructive ambitions.