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As Tara (Amber Benson) and Willow (Alyson Hannigan) tentatively reignite their romance, Anya (Emma Caulfield) seeks to dull the pain of her own failed relationship. Newly returned to the vengeance-demon fold, Anya seeks payback against Xander (Nicholas Brendon) for leaving her at the altar (see "Hell's Bells"). When her attempts to elicit potentially deadly wishes from his unsuspecting friends fizzle, she turns to Spike (James Marsters), hoping the vampire's dislike of Xander will make him amenable to revenge. Spike, however, is at the Magic Box, busily trying to cast a spell of his own to numb his pain at being dumped by Buffy (Sarah Michelle Gellar). Bitterness and booze soon lead the lovelorn pair to find solace the horizontal way. Unfortunately, their tryst is captured by the hidden cameras of the super-nerd troika -- at the exact moment Willow (Alyson Hannigan) is hacking into the villains' computer system. Despite the grainy Internet footage, Buffy, Xander, Willow, and Dawn (Michelle Trachtenberg) witness everything. Xander's first response is to acquaint Spike with the pointy end of a stake, but Buffy interrupts her friend's hotheaded attack. As all four exes square off, Buffy reluctantly admits her former relationship with Spike to Xander. Hurt and confused, Xander storms off, giving Anya a taste of vengeance, though not in the way she was hoping for. Originally broadcast April 30, 2002, on UPN, "Entropy" marked episode 118 of the cult-favorite series.