Eggbert in front of Gallagher Elementary School.

Eggbert Eggleston
is considered a very ugly and sickly boy with an egg-like body shape, hence his name. He was first seen in Operation: Z.O.O., where he is caged in the Ugly Children display.

At the end of Operation: E.L.E.C.T.I.O.N.S., Eggbert Eggleston is revealed to have won the election for fourth grade president at Gallagher Elementary, despite the dishonest Wilson Woodrow's earlier claim that Numbuh 1 had won the election, which was a lie simply made to have him help defeat the Delightful Children from Down the Lane. In that episode, they had bribed Wilson to "fudge" the results and elect them as the president, despite the fact that they were not even a candidate at all.

Eggbert Eggleston Celebrate

Eggbert celebrating with his family after winning the race.

In Operation: M.E.S.S.A.G.E., Numbuh 2 is called in to deliver a note from Eggbert to Muffy Jenkins. The note is revealed at the end of the episode to read "The Splinter Cell is real", indicating that Eggbert may know more about the Kids Next Door than his dim personality might lead one to believe.

Eggbert often makes appearances in episodes, including Operation: N.A.U.G.H.T.Y., Operation: C.A.K.E.D.-F.O.U.R. and many others.

KND Eggbert in the background

Eggbert in the background on the KND Moonbase

Also Eggbert could possibly be an operative because he was in the background while Tommy was talking about having a room next to Numbuh 1 in Operation: G.R.A.D.U.A.T.E.S after Numbuh T inserted his genetic material into the KND Code Module.This was seen five minutes into the episode. Eggbert also appeared in Operation: S.N.O.W.I.N.G. as one of the kids who were captured by President Jimmy.

He also appeared in Operation: B.R.E.A.K.U.P. standing in line at the stadium.