UPN will wrap up Buffy the Vampire Slayer with five new episodes, starting April 15, featuring the return of former series regulars David Boreanaz (Angel) and Eliza Dushku (Faith) and guest star Nathan Fillion (Firefly). Subsequent episodes will air April 29, May 6 and May 13, with the series finale on May 20.

This five-episode story arc will pit Buffy (Sarah Michelle Gellar) against her most insidious and evil opponent ever, Caleb (Fillion), a depraved operative of the First. A final battle to the death will decide whether good or evil will prevail on Earth. Buffy airs Tuesdays at 8 p.m. ET/PT.