S1, E5: Now in high school, teenage witch Sabrina Spellman's powers have grown stronger. Sabrina, who is half mortal, is trained by aunts Hilda and Zelda to use her magic well. Cassandra, Sabrina's nemesis who attends the same school, is a full witch who lives in the mortal realm. Cassandra tries to make Sabrina's life miserable. Harvey Kinkle, one of Sabrina's best friends, often finds himself in the middle of fights involving the two young witches.