Investigating evidence of an alien autopsy, Mulder infiltrates a secretive government train carriage carrying an alien-human hybrid. Mulder is almost killed by a Syndicate operative guarding the hybrid, but is saved by his informant X (Steven Williams). X had been tipped off about Mulder's activities by the agent's partner Dana Scully (Gillian Anderson). Scully, meanwhile, meets a group of women with abduction experiences similar to her own, and meets another member of the Syndicate known as the First Elder (Don S. Williams), who claims during her abduction she was placed on a similar train car and experimented upon by the Japanese scientists.