The same accident that made Xev part cluster lizard also deprived the robot drone 790 of his human body. Now he's just a mechanical head with the love slave part of the programming that Xev failed to receive.
790's programming causes him to fall in love with anyone he sees whenever he's been reset. Hilarity often ensues, as he is supremely jealous of everyone and everything he perceives as a threat to his beloved.
Links for 790