Who Are You?

"Who Are You" is the 16th episode of season 4 of the television show Buffy the Vampire Slayer.

Buffy, in Faith's body, is abducted by the Council's team and taken to a barn as her captors await instructions. Meanwhile Faith, in Buffy's body, gives herself a makeover and heads to the Bronze, where she has ruthless fun at the expense of Spike and Tara. Tara recognizes that something is wrong, and she and Willow perform a spell to find the real Buffy. Faith visits Riley and has sex with him while Buffy escapes the Watchers' Council retrieval team and heads back to Sunnydale in search of Giles and her friends. Faith and Buffy both decide to rescue a group of people in a church that has been attacked by vampires. Buffy and Faith then fight each other, and Buffy (with the help of Willow and Tara's magic) restores herself and Faith to their rightful bodies. Faith subsequently escapes from Sunnydale and Buffy discovers that Riley had slept with Faith during the body swap.

Quotes and trivia

 * Sarah Michelle Gellar cites this as one of her favorite episodes, saying that "Eliza was brilliant."
 * The credits show "ELIZA DUSHKU as Buffy" (not Faith) as a special guest, so the credits reflect the exchange correctly.
 * We learn in this episode that at some point in the past Buffy was issued a U.S. passport. As we see Faith (in Buffy's body) looking at her passport during or after she buys a plane ticket to Mexico.