Numbuh 2x4 is one of the judges at the 2x4 Technology Convention in Operation: S.C.I.E.N.C.E.. He is a huge scientist with robotic eye and robotic helmet. He was seen looking at the entries of Sector H, Sector G, Numbuh 80 and Numbuh 2. In Numbuh 4 and the Gangster, he got eaten by giant orca.