Chyler Leigh as Alex Danvers in a promotional image for season one.
First appearance
"Pilot"
Supergirl
October 26, 2015
Last appearance
"Armageddon, Part 4"
The Flash
December 7, 2021
Created by
Greg Berlanti
Ali Adler
Andrew Kreisberg
Portrayed by
Chyler Leigh
Jordan Mazarati (young; 2003)
Olivia Nikkanen (young; 2007 and 2009)
In-universe information
Full name
Alexandra Danvers
Alias
Sentinel
Title
Ph.D. M.D.
Occupation
Bio-engineer, physician, scientist, field agent, director of the DEO
Family
Eliza Danvers (mother)
Jeremiah Danvers (father, deceased)
Kara Danvers (adoptive sister)
Significant others
Kelly Olsen (wife)
Children
Esme (adoptive daughter)
Abilities
Scientist, physician, tactician, and detective
Expert in human and extraterrestrial physiology
Master hand-to-hand combatant, martial artist, and markswoman
Proficiency with advanced DEO and extraterrestrial weaponry
Utilizes Kryptonite powered exosuit and sword
Alexandra "Alex" Danvers Ph.D. M.D., also known as Sentinel, is a fictional character from the Arrowverse television series Supergirl, portrayed by actress Chyler Leigh. Created by executive producers Greg Berlanti, Ali Adler, and Andrew Kreisberg, the character was introduced in the pilot episode as the elder adoptive sister of protagonist Kara Danvers / Supergirl. Alex is a bioengineer, physician, scientist and a field agent of the DEO, a secret government agency that works to protect the Earth from extraterrestrial threats. She later becomes the director of the organization at the end of season three, after having been J'onn's second-in-command for years, and remains so through season five. Alex is also featured in the show's digital tie-in comic book series, Adventures of Supergirl, as well as the 2017 four-part Arrowverse crossover event "Crisis on Earth-X", with Leigh reprising her role across The Flash, Arrow, and Legends of Tomorrow.
Arrow, and Legends of Tomorrow. AlexDanvers is the only biological child of scientists Eliza and Jeremiah Danvers. When Alex was a teenager, her parents...
introduced in the pilot episode as the adopted younger sister of AlexDanvers. Kara Danvers is portrayed by Melissa Benoist as an adult, and Malina Weissman...
and was taken to live with his friend Jeremiah Danvers. She assists her adoptive sister, AlexDanvers, as part of the Department of Extranormal Operations...
in the ABC medical drama series Grey's Anatomy (2007–2012; 2021), and AlexDanvers in the DC Comics superhero series Supergirl (2015–2021). Leigh was born...
Quentin to move on from their past. AlexDanvers (portrayed by Chyler Leigh) is the adoptive sister of Kara Danvers and second-in-command of Department...
the series finale. Melissa Benoist as Kara Danvers / Kara Zor-El / Supergirl Chyler Leigh as AlexDanvers / Sentinel Katie McGrath as Lena Luthor and...
Play media franchise Alexandra Danvers, a.k.a. AlexDanvers, Kara Danvers' sister in Supergirl Alexandra Dunphy, a.k.a. Alex Dunphy, character in the popular...
military base, where Danvers meets Dr. Walter Lawson, the human alias of alien Kree hero Captain Marvel. In a later story, Danvers is caught in the explosion...
Linda Danvers, and Cir-El. Following the cancellation of the third Supergirl comic book series (1996–2003), which starred the Matrix/Linda Danvers version...
Melissa Benoist as Kara Danvers / Kara Zor-El / Supergirl Mehcad Brooks as James Olsen / Guardian Chyler Leigh as AlexDanvers Katie McGrath as Lena Luthor...
Melissa Benoist as Kara Zor-El / Kara Danvers / Supergirl Mehcad Brooks as James Olsen Chyler Leigh as AlexDanvers Jeremy Jordan as Winslow "Winn" Schott...
Melissa Benoist as Kara Danvers / Kara Zor-El / Supergirl Mehcad Brooks as James Olsen / Guardian Chyler Leigh as AlexDanvers Jeremy Jordan as Winslow...
relocate David to Jaiju, China. AlexDanvers / Sentinel (portrayed by Chyler Leigh) – The adoptive sister of Kara Danvers and second-in-command of the DEO...
Luthor until she is arrested in the third season and he is defeated by AlexDanvers. Discussing his character, Harewood said that "Hank Henshaw ends up becoming...
and "Bizarro", Bizarro-Girl attacks Supergirl, who joins forces with AlexDanvers to stop the former with Blue Kryptonite bullets; this results in Bizarro-Girl...
episode "Manhunter", she and Jim Harper interrogate Martian Manhunter and AlexDanvers before taking them into Project Cadmus. Supergirl reveals her identity...
Shayan Bayat as Aariz Mousa Ryan Jefferson Booth as King Chyler Leigh as AlexDanvers / Sentinel Kandyse McClure as Xotar Cress Williams as Jefferson Pierce...
later becomes romantically involved with AlexDanvers, Kara Danvers / Supergirl's adoptive sister. Maggie and Alex get engaged at the end of the season....
counterpart of Harrison Wells from an unspecified Earth. AlexDanvers (portrayed by Chyler Leigh) – Kara Danver's adoptive sister and former agent now head of the...
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