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"Well well, if it isn't my oldest daughter. What are you, oh PU, we better operate immediately girl!"
-- Dr. Lincoln
Dr. Lincoln is the father of Numbuh 5, Cree and Junior Lincoln. Like most adults, he seems pretty oblivious to the KND's goings-on. He thinks his two daughters, Numbuh 5 and Cree Lincoln, get along well, unaware of their deep rivalry.
Before he became a doctor, it is revealed he used to be a clown as seen in a flashback in Operation: C.L.O.W.N.. He was friends with a fellow clown named Bonko, but after Bonko failed to deliver a punch line at a birthday party and got clobbered by the kids at the party, Lincoln decided that being a clown was stupid and got a real job as a doctor.
He went onto marry and fathered Numbuh 5's Brother, Cree Lincoln and Abby. He has no prominent role in the series except for embarrassing his daughters and getting scolded for it by them. In one episode, he had reunited with Bonko at a circus and after discussing why he never went back to being a clown, he got jobs for Bonko and his gang jobs at the hospital he works at. He and Bonko decided to deliver one last joke for old times' sake: the chicken crossing the road joke. But like before, Bonko failed to deliver the punch line and got clobbered by the audience at the circus.
- His face is never shown throughout the series, but his mouth is shown in Operation: S.U.P.P.O.R.T. and Operation: C.L.O.W.N..
- Its revealed that he is a grandfather at a very young age, due to him having a son who has children of his own.
- He is an obvious parody of comedian and convicted felon Bill Cosby's The Cosby Show character, Dr. Huxtable, due to him being a doctor, wearing sweaters, and having similar mannerisms in his speech.
- He is voiced by Kevin Michael Richardson throughout the episodes he appeared.