Episode 91 of "Buffy, the Vampire Slayer"
s05e13 Blood Ties
Title: Blood Ties
Original Air Date: 02/06/2001 on WB
Director: Michael Gershman
Writer: Steven S. DeKnight
Guest Stars: Michael Emanuel (Burly Guard), Joe Ochman (Janitor), Paul Bates (Crazy #1), Carl J. Johnson (Crazy #2), Candice Nicole (young Buffy), Elyssa D. Vito (young Dawn)
Plot Outline:
Buffy finally tells her friends about Dawn being the Key and they start acting weird around Dawn, which leads to her seeking answers. She knows that crazy people know what she is, so she goes to the mental ward at the hospital. While she's there, she runs into Ben. Ben freaks when she tells him she is the key and tells her to run away fast, but before she gets a chance to get away from him, he turns into Glory.