Buffy the Vampire Slayer: Family (2000)

Synopsis
As Buffy (Sarah Michelle Gellar) strengthens her resolve to protect supernaturally incarnated sister Dawn (Michelle Trachtenberg) from malevolent über-demon Glory (Clare Kramer), Tara (Amber Benson) fears that her friends will discover her own otherworldly origin. The crisis begins when Tara's father, brother, and cousin arrive to escort her back home before her 20th birthday, at which time, they remind her, her demon heritage will manifest itself and make her a danger to those around her. Reluctant to let girlfriend Willow (Alyson Hannigan) and the others find out she's less than human, Tara casts a spell to prevent them from sensing any demons at all. Unfortunately, the enchantment prevents the gang from being able to see the minions Glory has dispatched to attack them. Only the reluctant intervention of smitten vampire Spike (James Marsters) -- acting on his newfound love for nemesis Buffy -- prevents a total massacre. Tara cancels her spell, her friends learn that she's part-demon, and then (again with help from Spike) everyone learns she's actually human after all. Overjoyed to find out that the demon legend was just a way to keep the women in her family subservient, Tara joyfully rejects her blood family and accepts her role as a member of the Scooby Gang. Originally broadcast November 7, 2000, on the WB network, "Family" marked episode 84 of the cult-favorite series. This episode also reveals that Ben (Charlie Weber), the handsome doctor Buffy keeps running into, somehow involuntarily shares his body with the fearsome Glory. ~ Brian J. Dillard, All Movie Guide