Where to watch Supergirl Season 3
Supergirl season 3 is streaming in Australia on HBO Max (subscription). You can also buy it on Apple TV from $29.99 and Fetch TV from $29.99. Season 3 was released on 9 October 2017.
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Stream (subscription)
Stream now on HBO MaxHBO Max
Subscription
From $11.99/mth
Buy or rent
Stream now on Apple TVApple TV
Buy
Buy from $29.99 a season
Get Fetch on Fetch TVFetch TV
Buy
Buy from $29.99 a season
Availability checked 4 November 2026. Streaming availability data from JustWatch.
Supergirl Season 3 episodes
S03 E01
Girl of Steel
40 mins · Mon, 9 Oct 2017
Kara handles the loss of Mon-El by focusing on being Supergirl and concentrating on a mysterious new threat. Alex reveals a secret to Maggie, a citizen of National City has a connection to Kara, and Lena takes a bold move.
S03 E02
Triggers
40 mins · Mon, 16 Oct 2017
A thief with psychic powers attacks National City, immobilising victims by tapping into their worst fears. Samantha begins her new job at L-Corp.
S03 E03
Far From the Tree
42 mins · Mon, 23 Oct 2017
Eliza throws Alex and Maggie a wedding shower, Maggie reaches out to her estranged father and Supergirl joins J'onn on a personal mission.
S03 E04
The Faithful
42 mins · Mon, 30 Oct 2017
Kara investigates a new group with a mysterious connection to Supergirl, Samantha feels like she's letting Ruby down and J'onn confesses an old secret.
S03 E05
Damage
42 mins · Mon, 6 Nov 2017
Morgan Edge blames Lena's lead bomb when multiple children get sick, Kara teams up with Samantha to clear Lena's name and Alex and Maggie come to a decision about their relationship.
S03 E06
Midvale
42 mins · Mon, 13 Nov 2017
Kara recalls a painful memory from childhood involving the death of a friend. The Danver sisters reflect on how the traumatic experience brought them closer.
S03 E07
Wake Up
40 mins · Mon, 20 Nov 2017
Kara looks into an alien ship that crash lands underwater beneath National City. Hank tries to bond with his father. Samantha seeks answers from her estranged mother.
S03 E08
Crisis on Earth-X, Part 1
40 mins · Mon, 27 Nov 2017
When villains from Earth-X launch an attack at Barry and Iris's wedding, the superheroes work together to save the world.
S03 E09
Reign
42 mins · Mon, 4 Dec 2017
A strange symbol begins to appear all over National City, which turns out to be the mark of the World Killer, Reign. Tension continues to increase between Lena and Morgan Edge.
S03 E10
Legion of Superheroes
42 mins · Mon, 15 Jan 2018
Struggling to heal from her injuries inflicted by Reign, Supergirl remains in a dreamlike state, unable to be reached. Mon-El recruits a Legion member to try bringing her back, and the DEO teams up with the Legion of Superheroes to try to stop Reign.
S03 E11
Fort Rozz
42 mins · Mon, 22 Jan 2018
Supergirl teams up with Saturn Girl, Livewire and Psi to recover a prisoner who has information on how to defeat Reign.
S03 E12
For Good
42 mins · Mon, 29 Jan 2018
Kara intervenes and helps Lena when she receives threats from Morgan. Alex runs some medical tests to see if she's able to help Sam.
S03 E13
Both Sides Now
42 mins · Mon, 5 Feb 2018
J'onn, Winn and Mon-El work together to patch up the Legion ship. Supergirl and Alex use different means of interrogation to learn how to defeat Reign after the DEO captures a second Worldkiller.
S03 E14
Schott Through the Heart
40 mins · Mon, 16 Apr 2018
Winn's father passes away in prison, and his estranged mother returns to try and reconnect with him after explaining why she left him. A copycat Toyman attacks, and the two must join forces to stop the culprit.
S03 E15
In Search of Lost Time
40 mins · Mon, 23 Apr 2018
Myr'nn causes psychic disturbances at the DEO, and Supergirl must work with J'onn to contain the chaotic situation. Meanwhile, Mon-El commences teaching Kara fighting techniques from the future.
S03 E16
Of Two Minds
40 mins · Mon, 30 Apr 2018
Supergirl and Imra disagree on how to stop the third Worldkiller, but when Pestilence injures Alex and Winn, the two join forces to stop the destruction.
S03 E17
Trinity
42 mins · Mon, 7 May 2018
Supergirl turns to Guardian for help in the wake of discovering Lena's secret. Meanwhile, Supergirl and the team prepare to face off against all three Worldkillers.
S03 E18
Shelter From the Storm
42 mins · Mon, 14 May 2018
Supergirl and Alex work together to keep Ruby safe when she becomes Reign's new target. Supergirl and J'onn seek advice from Sam's mum on how to stop Reign.
S03 E19
The Fanatical
42 mins · Mon, 21 May 2018
Kara and James receive a journal from an escaped disciple of Coville, and hope to find a means to save Sam in its pages. Meanwhile, someone threatens to expose James' secret, if he doesn't do as instructed.
S03 E20
Dark Side of the Moon
40 mins · Mon, 28 May 2018
Supergirl's world is turned upside down when she learns a secret about Krypton's demise. Alex is attacked while out with Ruby, and Lena considers the lengths she will go to to keep Reign contained.
S03 E21
Not Kansas
40 mins · Mon, 4 Jun 2018
Kara makes a decision with the potential to change her life forever, and J'onn learns that Special DEO-caliber guns have made it to the streets of National City.
S03 E22
Make It Reign
40 mins · Mon, 11 Jun 2018
Supergirl, Mon-El, and Alura learn the truth of Serena's plans for Earth and must concoct a plan to prevent her from carrying them out, while J'onn prepares to say goodbye to his father.
S03 E23
Battles Lost and Won
40 mins · Mon, 18 Jun 2018
Supergirl and the team go head to head with the Dark Kryptonians in an epic battle for Earth, and fight to save their friend. Meanwhile, Winn is offered a once in a lifetime opportunity.