Buffy the Vampire Slayer (1997)

S7E10 Bring on the Night

Giles arrives back in Sunnydale, bringing with him three potential slayers that Buffy must safeguard from the clutches of The First. At the same time, an unstoppable Uber-vampire escapes from the Hellmouth, posing a deadly threat. Buffy faces the urgent challenge of defeating this powerful foe before it can take the life of one of the potentials.