A bigoted human policeman in the L.A. of the future and his alien partner learn to live with each other's differences while attempting to solve a drug conspiracy hidden in the subculture of Los Angeles' newest immigrant population: extraterrestrials.
The murder of an astronomer leads Sykes and Francisco to the discovery of an extra-terrestrial probe passing through the solar system. But is it friend or foe? Sikes' relations with his Newcomer neighbor, Cathy, develops. George and Susan discuss having another baby.
A series of murders of Binnaum, a rare kind of Tenctonese needed for catalyzing reproduction, raises fears that Purists are trying to stop the Tenctonese from breeding. Francisco asks Albert to be the Binnaum for his and Susan's next child.