Codename: Kids Next Door - Operation Z.e.r.o. -

: The film explains the significance of the Book of KND, a legendary archive of past stories and the source of the organization's power.

The story centers on the resurrection of , a reality-warping tyrant who once ruled the world when today's villains were merely children. After being reawakened by his son, Father , Grandfather begins transforming the world's population into "Senior Citi-zombies"—obedient slaves forced to produce endless supplies of tapioca to refuel his powers. Codename: Kids Next Door - Operation Z.E.R.O.

: The film establishes that Father (Benedict Uno) is actually Nigel’s uncle, making Grandfather Nigel's grandfather. : The film explains the significance of the