Numbuh 20,000 is the head of security at the Deep Sea Science Lab. He apparently went insane after the "Cootie Girl" escaped and attempted to ram the command ship into the base out of desperation in Operation: O.U.T.B.R.E.A.K.. In Operation: T.R.E.A.T.Y., he asked if they were going to lauch a full out nuclear cheese strike on the teenagers. He is later seen commanding the SKWID Squad in Operation: B.R.I.D.G.E.. He was also seen in The Grim Adventures of the KND, where he is seen piloting a Mandy ship, while getting a direct request from Mandy herself.