Mercedes McNab was born to Bob McNab, a well-known former English footballer who played for the England national team & Vancouver Whitecaps football club.
Mercedes began her acting career at the age of ten with the film "The Addams Family" (1991); where she played the role of Girl Scout selling cookies and went on to appear in its sequel "Addams Family Values" {1993}.
Mercedes got a breakthrough role of Harmony Kendall on "Buffy the Vampire Slayer" (16 episodes: 1997-2003) and reprised her role in its spin-off "Angel" (18 episodes: 2001-2004).