Operation S.I.X. (2007)

In "Operation: S.I.X. (Soda Is X-changed)", a mysterious girl approaches Numbuh 2 and asks him to drive a tanker truck filled with soda to her birthday party. This has to be done in secret, because soda is illegal to anyone under the age of 13. After a spy informs Mr. Fizz and the Soda Control Board, they set out to stop Numbuh 2 - as well as Numbuh 3 and Numbuh 6 a.k.a. Bradley the skunk, who are accompanying him. But is there another purpose to this delivery that none of them know?