Codename: Kids Next Door - Operation Z.e.r.o. ✯ 〈Essential〉

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

: The film explains the significance of the Book of KND, a legendary archive of past stories and the source of the organization's power. Codename: Kids Next Door - Operation Z.E.R.O.

: In a major series twist, Numbuh 0 is revealed to be Nigel’s father, Monty Uno . : The film establishes that Father (Benedict Uno)