Charne-Sayre, a doctor who is developing a black oil vaccine for the Syndicate. He then tracks down Charne-Sayre's test subjects and tests the Russian vaccine on them before killing them to cover his tracks. Mulder is found by a group of Russian peasants (one of whom owns the truck that Mulder stole), who help him return to America, and rejoins his partner Dana Scully (Gillian Anderson). Scully and assistant director Walter Skinner (Mitch Pileggi) had been detained by a United States Senate committee seeking to uncover Mulder's whereabouts when they cannot reveal his current location, but the committee was adjourned upon Mulder's arrival. The agents attempt to track down Peskow, following a trail of murders in Boca Raton, Florida, as well as locating a stolen truck. However, the assassin is able to outwit the agents, and destroys the last of the oil-containing rocks seen in the previous episode in an oil-well explosion after Mulder fails to remove the bomb. He returns to Russia, where it is revealed that he had been hired for this task by Krycek. Production The episode's title refers to terma, a set of Buddhist teachings hidden from the world. Series creator Chris Carter felt these represented the secrets kept by the Syndicate. The opening credits of the episode saw the series' usual tagline of "The truth is out there" replaced with "E pur si muove". The phrase is Italian for "and yet, it moves", and is attributed to the astronomer Galileo Galilei, when forced by the Roman Inquisition to denounce his belief in heliocentrism. The episode's gulag scenes were inspired by Aleksandr Solzhenitsyn's works The Gulag Archipelago (1973) and One Day in the Life of Ivan Denisovich (1963). Shots of the oil refinery seen in the episode were filmed at a thermal energy station situated in Port Moody, British Columbia. The climactic oil-well explosion was achieved through physical effects, with crew member Dave Gauthier building a replica wellhead in a disused rock quarry, through which liquid was piped at pressures of to create a plume high. This wellhead was rigged to spray oil-colored water for shots of the plume itself, which was switched with a remote control to a stream of kerosene and liquid propane for the shots involving the oil catching fire. Actor Nicholas Lea, who plays recurring character Alex Krycek, worked with a Russian-speaking vocal coach to ensure that his dialogue was delivered with