3×19 April 2, 1999
THE HOUSE-GUEST (Serial 37, Episode 1)
Setting: Seattle, WA, UNIT Time
Regular Cast: Hugh Laurie (The Doctor), Sarah Michelle Gellar (Lizzie Thompson)
Guest Cast: Jonathan Frakes (Agent Blackwood), Ron Canada (Agent Fesick), Malcolm McDowell (Mr. McMaster/Sam Tether/The Master)
Plot: The Master describes Earth, a place of great natural beauty, abundant mineral resources, and strategic location. While derisive toward human intellect, he grants that humans are prolific and highly adaptable. At UNIT, Agent Blackwood is finishing the clean-up after the Cyb incident. Lizzie has gotten settled in her new apartment when the Doctor surprises her by materializing in her living room and asking to stay for a few days. He tells her about seeing the man they know as McMaster in eighteenth-century Europe, and that he believes McMaster has been using Seattle as his base of operations. He works with UNIT to trace McMaster’s endeavors in the city, leading him to realize McMaster may have been involved with . McMaster, now operating under the alias “Sam Tether”, discovers the Doctor’s investigation and begins to set a trap. Despite the time they have spent together so far, Lizzie finds the Doctor a difficult roommate, and their friendship becomes stressed. While watching the local news, she gives the Doctor the idea that more mundane local crime might be connected to McMaster’s activities. UNIT is able to correlate a series of unsolved burglaries with business acquisitions to uncover the scope of McMaster’s empire. The Doctor concludes that McMaster is building a hyperspace transmitter, and this might be a prelude to a return of the Nestene consciousness – or something worse. The Doctor wants to confront McMaster, but Blackwood is unable to act, as they can’t even prove that Tether and McMaster are the same person. After a fight with Lizzie, the Doctor decides to confront McMaster/Tether alone. Lizzie improves the computer search UNIT used to discover the Sam Tether identity and finds older activities under another alias, “Matt Shere”, which suggest that he had already completed the hyperspace transmitter months ago. She realizes that the Doctor is walking into a trap, and convinces Blackwood to put together a rescue. At the headquarters of Tether’s company, the Doctor confronts his enemy, who introduces himself as the Master. He claims that he and the Doctor knew each other long ago, though the Doctor does not remember. He offers the Doctor a partnership, though is careful not to give away his plan, beyond the fact that it will yield unfathomable wealth and power. The Doctor rebuffs the offer and promises to prevent the Master from completing his transmitter, but the Master laughs this off; he isn’t building a transmitter, but a weapon which will destroy a large part of the city. He sets a countdown and challenges the Doctor to defuse the device. The Doctor attempts to trap the Master in the room with him, forcing him to disable the weapon to save himself, but the Master overpowers him and knocks him unconscious. UNIT arrives minutes later, having located the Doctor with the life-sign scanner he built for them previously. The Doctor refuses to leave without defusing the weapon, but is unable to. When the timer runs out, instead of activating, the weapon plays a taunting message from the Master, forcing the Doctor to admit he’s been outmatched. Lizzie asks about the Master’s accomplice, confusing the Doctor. The scanner had detected two heartbeats in the office in addition to his own, causing the Doctor to realize that the Master must be a fellow Time Lord. The Master completes his narration about the riches of Earth, now revealed to be the message he had broadcast months earlier. He ends the transmission by declaring bidding for the planet open.