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Xander (Nicholas Brendon) -- the only member of the Scooby Gang without supernatural abilities of his own -- takes the spotlight when an encounter with a demon named Toth (Michael Bailey Smith) splits him into two separate versions of himself, one with all the good qualities and the other with all the bad. The inept Xander soon discovers the existence of his enhanced twin but is dismayed to watch his double succeeding in all the areas where he usually fails. The new, improved Xander not only lands a promotion at his construction job, but also signs the lease on a fabulous new apartment to please girlfriend Anya (Emma Caulfield), who is feeling vulnerable now that she's no longer an immortal demon. When the happy couple learn of the bumbling doppelganger Xander, Anya wants to keep him around as a sex toy while shiny happy Xander wants to kill him. Luckily, Giles (Anthony Stewart Head) and Willow (Alyson Hannigan) figure out that if one Xander dies, both will. While Willow works to break Toth's spell, Buffy (Sarah Michelle Gellar) tracks down and kills the demon. Soon things are back to normal enough that Riley (Marc Blucas) has time for a heart-to-heart with Xander, in which he reveals that although he's in love with Buffy, he doesn't believe she loves him back. Originally broadcast October 10, 2000, on the WB network, "The Replacement" marked episode 81 of the cult-favorite series. Kelly Donovan, Nicholas Brendon's real-life twin, portrays the alternate Xander; although their last name is Schulz, the thespian brothers use only their first and middle names professionally.