Season four begins with Buffy and Willow starting college, attending U.C. Sunnydale, while Xander works at a series of odd jobs and begins dating Anya Jenkins (Emma Caulfield), who lived for 1,100 years as a vengeance demon before losing her powers and getting stuck in the body of a teenager. In the fourth season, Willow becomes romantically involved with fellow-student Tara Maclay (Amber Benson), an experienced witch. The Big Bad in season four is the result of the work of a covert military force called "The Initiative" who are capturing and performing experiments on vampires and demons in Sunnydale. Buffy and her friends discover that chief amongst these experiments is the creation of a human-cyber-demonoid hybrid known as Adam (George Hertzberg), whose programming has gone terribly wrong, leading him to wreak havoc on the town. Buffy's challenge is to find a way to disempower him, something she and the Scoobies achieve in the penultimate episode of season four, "Primeval". In order to do this, the four magically join their essences together to create a single "super Slayer"; while the others perform a ritual, Buffy confronts and defeats Adam while mystically empowered with Giles' mind, Xander's heart, and Willow's spirit aiding her. The ritual employs four tarot-like cards: "Manus" (meaning hands or strength) represents Buffy, "Sophus" (meaning teacher or wise) represents Giles, "Animus" (meaning courage, or heart) represents Xander, and "Spiritus" (meaning spirit and magical power) represents Willow. These symbols will become relevant to the central motif in each of the episode's four dream sequences.