"Operation: G.R.O.W.-U.P."
Season 1, Episode 13
Mission:	026
Production Code:	113
Airdate:	March 07, 2003
Credits
Writer(s):	Mr. Warburton Mo Willems
Storyboards by:	Kim Arndt Maurice Fontenot
Episode Guide
Previous Mission "Operation: R.A.I.N.B.O.W.S."	Next Mission "Operation: C.A.T.S."

Getting Really Old Will Upset Plans

Information

Summary: The episode starts with Numbuhs 2,3,4,and 5 being attacked by the notorious Delightful Children From Down The Lane. But once again, they are defeated when Numbuh 1 shows up and defeats them. Father - appearing for the first time - is disappointed with the DCFDTL, but gives his children once more chance, giving the kids "The Really Really Incredibly Destructive Machine" at their request. They return to the Treehouse, and after a long, destructive battle, transform Numbuh 1 into an adult (using the Age Cigar from Operation: C.A.B.L.E.-T.V.). Numbuh 1 must therefore leave the KND, because he is too old to be in it, and leaves to find a job. The story skips ahead two weeks later. The DCFDTL have destroyed their treehouse, so Sector V uses a cardboard box as a temporary clubhouse. Finally, Numbuh 4 convinces the others to go get ice cream, but Numbuh 1, the ice cream truck driver, refuses to give any of the kids ice cream, much to their disappointment.

The team goes to visit the Delightfuls, and manage to steal the device - but the Delightfuls refuse to give it up, and they struggle over the ray, turning into teens, babies, and even seniors. The battle ends with Numbuh 1 coming in, simply asking for the Age Cigar. The Delightfuls are incredulous until he points out that he is now an adult, and therefore, they must obey him.

The Delightfuls reluctantly hand over the remote just as Father comes in, congratulating Nigel on "tricking a bunch of kids." Father than unleashes his demonic fire powers on Nigel. Mr. Uno and the Sector V agents fight back, finally overcoming him with a barrage of Nigel's ice cream. Nigel is turned back to normal, and the team leaves. Due to the attack from The Really Really Incredibly Destructive Machine, however, the Treehouse is in ruins. Numbuh 1, however, is not worried, as he states, "It's going to be a long time before [they] grow up."

The end credits show their Treehouse being rebuilt.

• Villain Debuts: Father
• Ally Debuts: Grown-up Numbuh 1
• Starring: Sector V
• Locations: Sector V Treehouse, Delightful Mansion From Down The Lane
• 2x4 Tech: H.I.P.P.I.E.-H.O.P.
• Villain Technology:Really Really Incredibly Destructive Machine,  Age Cigar
• Time Cards Shown: Two Weeks Later

Trivia/Goofs

• This is the fifth Numbuh 1 episode.
• This is the first appearance of Father, the KND's biggest enemy, who was only mentioned before in Operation: C.A.N.N.O.N. and Operation: Z.O.O. His next episode is Operation: T.R.A.I.N.I.N.G.
• If Numbuh 1 became an adult, why wasn't he decommissioned? Though this may be because the KND Moonbase hadn't been introduced into the series yet.
• This is the season 1 finale.
• When Father appears after the DCFDTL give the ray to Adult Numbuh 1 he is at the the top of the stairs but in the scene when he is speaking he was at the bottom of the stairs
• This is the first episode that has rain in it.
• At the end when Sector V has defeated Father and the DCFDTL, the Delightful Children were trembling, showing they have a fear towards Sector V.
• This is the first 30-minute episode.
• This is one of the few times when the DCFDTL do not speak in complete monotone.it can be proven when they say yes sir to father their unison is broken up due to their fright
• This episode, being the season finale, contains numerous elements from past episodes, including the Age-Changing Ray from Operation: C.A.B.L.E.-T.V., Numbuh 2's fly suit from Operation: T.H.E.-F.L.Y., and H.I.P.P.I.E.H.O.P. from Operation: T.U.R.N.I.P.
• When Numbuh 3 and Numbuh 4 are in the ice cream truck, she was holding an orange popcicle. Hmmm. Who do we know who wears orange?
• While The Delightful Children were playing with the Age Cigar on Jenkins, their eyes temporarily were black instead of blue. (Along with the tall brunette boy when he temporarily transformed into an old man.)<videogallery id="0"></videogallery>
• When Numbuh 2 and Numbuh 5 land in front of the of the DCFDTL after Father blows them away the DCFDTL jokingly ask HAVING FUN?