When the corpses of recently deceased FBI agents turn up missing, Skinner assigns Mulder and Scully to the case, as it may have something to do with the Millennium Group. Mulder immediately consults with Frank Black (Lance Henriksen). He waves the agents off, but offers them subtle clues. The path soon leads them to an honest-to-goodness Necromancer (Holmes Osborne) who is aiding a splinter of the Millennium Group with their plan to become the Four Horseman of the Apocalypse. When Mulder finds his way to the Necromancer's compound, he encounters zombies. Will Scully catch up with him before they break the First Seal?
Justin and Erik attempt to determine which Horseman Frank Black would become. Justin praises the work of Osborne. Erik derails the discussion with a reference to Phantasm and explains the key to a good Adrian Pasdar impression. The pair introduce Tread Perilously's official medical expert, Dr. Gupta. Justin admits his newfound reluctance to like any celebrity. Erik rages against a lame "Scully's dead" fake-out while Justin gets mad about The X-Files zombie rules. Erik also suggests it would be silly to replace Mulder and Scully during the tail end of the series.