In the 21st Century, Tony Ricks was a criminal who was executed for his crimes. In the distant year 2020, he is revived in a freak accident, and must infiltrate a futuristic prison and retrieve a powerful bioweapon in exchange for his freedom... and his life.

In a series of interviews with the KND after they're all grown up, the former operatives are temporarily brought out of their decommissioned haze to discuss what happened during their very last mission with Numbuh one - where he disappeared and was never heard from again! It all started with a routine mission to get the Delightful Children's birthday cake, but when a mysterious boy steals it instead, he makes it available to whoever wants it, IF they can solve his 'simple' scavenger hunt first. Soon it's a mad, mad, mad, mad chase around the world as the KND, their friends, and virtually all of their enemies compete to win the yummiest cake ever

A young girl leaves for Nepal with her parents and brother. She is unhappy to leave her home at first, but soon isn't when she meets a handome young man. The story unfolds into a romantic and daring quest in search of the "Invisible City."