Alexander Lavelle Harris is a fictional character created for the action-horror/fantasy television series Buffy the Vampire Slayer (1997–2003). He was developed by Joss Whedon and portrayed throughout the television series by Nicholas Brendon and in two episodes by his twin brother, Kelly Donovan. He was conceived as an everyman and a male character for series heroine Buffy Summers to interact with, and to provide comic relief in the series. Xander is one of several friends of Buffy who assist her in saving the world against numerous supernatural events that plague Sunnydale, California, a town built over a doorway to hell.

Buffy the Vampire Slayer is an American supernatural drama television series created by writer and director Joss Whedon. The concept is based on the 1992 film, also written by Whedon, although they are separate and unrelated productions. Whedon served as executive producer and showrunner of the series under his production tag Mutant Enemy Productions. It premiered on March 10, 1997, on The WB and concluded on May 20, 2003, on UPN.