Rare zoo animals are being abducted and impregnated in a case that Mulder believes may be linked to an alien conspiracy.
Snitch Sid bunks with Buntz to hide from a vengeful ex-convict; Hill resents a bigoted partner; Goldblume aids a writer friend.
Newly allies himself with his prisoner, a hired killer, to escape bounty hunters and return to Dodge City.
An accident at a chemical warfare research station sends David on a frantic race for an antidote to save his and a friend's life.