The B9 Environmental Control Robot, affectionately referred to as the Robot or just Robot, was a Class M-3 General Utility Non-Theorizing Environmental Robot (G.U.N.T.E.R.) "designed and computerized as a mechanized electronic aid for Earth voyagers engaged in astral expeditions." ("The Ghost Planet"; "Time Merchant"; "Junkyard in Space") He had a male personality. ("Space Beauty")