Occupation Chad's best friend, Teen Ninja
Voice Rob Paulsen (Operation: E.L.E.C.T.I.O.N.S.)
Dave Wittenberg (Operation: T.R.E.A.T.Y.)
Homebase Teen Base
Cameos Operation: S.I.T.T.E.R.
Operation: M.A.U.R.I.C.E.
Operation: P.A.R.T.Y.

Justin Cavallero is one of Chad Dickson's friends who is also a Teen Ninja. It's unknown if he was ever a KND-operative or not.


His first appearance was in Operation: E.L.E.C.T.I.O.N.S., where he's first shown telling Chad that the Gallagher Elementary School-students have no chance against their Hendry Middle Schoolforces--but then they are both sent back to their seats (being in a classroom). Later during the battle between both schools, he interrupts Chad as he's sweet-talking a girl with the news that they might have some trouble defeating the elementary school-students. Chad then asks him to get their bikes (while warning Justin not to get his scratched or damaged). He makes no further appearances in the episode, it was unknown if he joined the battle or not.

He also appears in Operation: T.R.E.A.T.Y., when Chad and Numbuh 1 are in a Teen hangout underneath a mini-mart. He reminds Chad that no kids are allowed to know about their hangouts as he called Numbuh 1 stupid. Numbuh 1 angrily asks who are you calling stupid so he and several other Teen Ninjas chase him out. They intend to shoot him out of the sky; when Kids Next Door aviators tell him to stand down because they're in a "no-fly zone", he tells them that the guys they're chasing (Chad and Numbuh 1) stole his little brother's bike. It is unclear whether or not this was a lie, or if he really does have a little brother. However what ever the purpose is he needed some help from Kids Next Door aviators to shoot them down

An adult version of him appears in Operation: W.H.I.T.E.H.O.U.S.E., as one of Numbuh 1's, or else known as in that time period, President Uno's, bodyguard.

After Operation: T.R.E.A.T.Y., he makes no further appearances, and his voice is unknown.

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