Toronto native Alexandra Doig was born on June 8th, 1973, to Filipina mother Gloria and English-Scottish father David. Her parents held season tickets to their local theater, and Lexa was inspired to begin acting after seeing a production of "Porgy and Bess" at the age of nine. She dropped out of high school in grade 13, did modeling and commercial work, and hosted YTV's Video & Arcade Top 10 with friend Gordon Michael Woolvett.

Her first professional job came at the age of 19, when she was cast opposite William Shatner and Greg Evigan in "TekWar". She went on to appear in several projects for both the big and small screens, including CI5: The New Professionals, Jungleground and No Alibi, before landing a lead role in Jason X, the 10th installment in the Friday the 13th series. Shortly after, she captured the title role in Gene Roddenberry's Andromeda starring as the Andromeda Ascendant's sophisticated artificial intelligence system. She has also completed guest stints on several popular television shows, including Traders, Earth: Final Conflict, The Chris Isaak Show. Theatre credits include "Arsenic and Old Lace" and "Romeo and Juliet".

In her spare time, Lexa enjoys reading, roller-blading and playing RPG video games, "Dungeons and Dragons" being her favorite. She currently resides in Vancouver, British Columbia with husband Michael Shanks, children Mia and Samuel and two cats.
Her father, David, is of English and Scottish ancestry. Mother Gloria is Filipina. Divides her time between Vancouver (where she works) and Toronto (where she grew up). She has an older brother named Ted. Wife of Michael Shanks. Daughter, Mia Tabitha Shanks, born September 13, 2004 Studied American Sign Language as a teenager. Met her husband, Stargate SG-1 star Michael Shanks, when he guest-starred in the Andromeda Season One episode "Star-Crossed". Appeared in Jason X alongside her Andromeda co-star Lisa Ryder. In the film, Doig played a human and Ryder played an android while on Andromeda, the opposite is true. Appeared with Torri Higginson in TekWar, TekWar, TekWar: TekLords and Jungleground, who co-starred with her husband Michael Shanks in Stargate SG-1 and Stargate: Atlantis. Dropped out of high school in grade 13 (OAC). Was a rhythmic gymnast as a child. Son, Samuel David Shanks, born March 19, 2006 Her cousin is actor Rey-Phillip Santos.