"No, The Treaty must go...as planned!"
Numbuh Infinity(/∞) was one of the diplomats working with Numbuh 362 to make peace with the teenagers in Operation: T.R.E.A.T.Y.. Later, he was seen talking with Chad, who was heard saying "No way! I've worked too hard to be double crossed like this!". Numbuh Infinity then replied, "You know it was not my decision! They just told me to tell you!". Numbuh 1 correctly suspected that Chad and Numbuh Infinity were working together with the KND Splinter Cell and confronted him. Numbuh Infinity then claimed that Chad was trying to attack him, and he was about to have Chad attack Numbuh 1 when a group, led by Numbuh 86, broke into Numbuh Infinity's office and caught Chad.Numbuh Infinity then claimed that Numbuh 1 was working with Chad to stop the treaty, and they are both taken to the Arctic Prison. Later on, when the treaty is enacted, the teens end up betraying the KND after all, which Numbuh Infinity claimed, presumably truthfully, was not part of his plan. At the end of the episode, the two mysterious figures seen spying on Numbuh 1 throughout Season 6 are revealed to be Numbuh Infinity and Numbuh 74.239. However, Numbuh Infinity was never seen after this and only Numbuh 74.239 returned in the series finale, Operation: I.N.T.E.R.V.I.E.W.S. It is inferred from him being with Lizzie Devine and Numbuh 74.239 that he is an alien Galactic Level Operative who is disguised as a human just like them.
- His appearance seems to be a reference to Will Smith in the movie Men in Black.
- He is dressed in a tuxedo with a bow tie representing the infinity symbol.
- On the Rainbow Monkey site if you type his name then it will say Earth mission completed meaning he along with Numbuh Vine and Numbuh 74.239 are aliens in disguise from an unknown planet.