Supergirl

In the season three premiere, Kara (MELISSA BENOIST) deals with the loss of Mon-El by focusing all her energy on being Supergirl and the mysterious new threat to National City.

Psi (YAEL GROBGLAS), a thief with psychic powers attacks National City by immobilizing people with their worst fears. Meanwhile, Samantha starts at L-Corp.

Eliza Danvers (HELEN SLATER) throws a wedding shower for Alex and Maggie, which causes Maggie to reach out to her estranged father (CARLOS BERNARD).

Kara investigates a secretive new group whose leader, Thomas Coville (CHAD LOWE) has a mysterious connection to Supergirl. Meanwhile, J'onn confesses an old secret.

When Morgan Edge (ADRIAN PASDAR) blames Lena (KATIE McGRATH) for the fallout from the Daxamite bomb, Kara teams up with Samantha (ODETTE ANNABLE) to clear Lena's name.

Kara and Alex head home to Midvale, where Kara recalls a painful memory of a childhood friend's death and how that traumatic experience brought the sisters closer together.

Eager for some understanding of the changes she has been experiencing, Samantha looks to her estranged mother (BETTY BUCKLEY) for answers.

When villains from Earth-X attack the wedding ceremony of Barry Allen and Iris West, the Green Arrow, Supergirl, The Flash and White Canary unite their teams to save the world.

Supergirl investigates an ancient prophecy and the symbol of the World Killer Reign appearing all over National City. Tension builds between Lena and Morgan Edge.

With Supergirl struggling to heal from her injuries, Mon-El recruits Brainiac-5 (JESSE RATH) to help, while the DEO teams up with the Legion of Super Heroes to stop Reign.

Supergirl teams up with Saturn Girl (AMY JACKSON) and her former enemies Livewire (BRIT MORGAN) and Psi for a mission to recover a prisoner from Fort Rozz.

After an attempt on his life, Morgan Edge accuses Lena. When Lena fears her hatred for Morgan will take her to the Luthor dark side, Kara steps in to help her friend.

After the DEO captures a second Worldkiller, Purity (KRYS MARSHALL), Supergirl and Alex use very different methods of interrogation to learn more about Reign.

When Winn's father dies, his estranged mother (LAURIE METCALF) reappears and tries unsuccessfully to reconnect – until a copycat Toyman attacks.

When Myr'nn inadvertently causes psychic disturbances at the DEO, Supergirl works with J'onn to contain the resulting chaos. And, Mon-El trains Kara in fighting Worldkillers.

When both Alex and Winn are seriously injured by Pestilence (ANGELA ZHOU), Supergirl and Imra (AMY JACKSON) team up to stop the destruction.

Still reeling after learning Lena's secret, Supergirl asks Guardian for a favor and braces for an epic battle against all three Worldkillers.

When Reign starts hunting Ruby, Supergirl and Alex work to keep her safe. Meanwhile, Kara and J'onn seek out Sam's mother for advice to stop Reign.

One of Coville's disciples (NESTA COOPER) escapes the cult and gives Kara a journal that could hold the key to saving Sam. And someone learns Guardian's identity.

Supergirl is stunned to discover that a part of Krypton survived. Meanwhile, Alex is attacked while out with Ruby, and Lena considers how far she will go to keep Reign contained.

While J'onn finds out that special DEO-caliber weapons have hit the streets of National City, Kara considers a major life decision.

While J'onn prepares to say goodbye to his father, Supergirl, Mon-El and Alura (ERICA DURANCE) devise a plan to stop Selena (ANJALI JAY) before she gets to Earth.

Supergirl and her team take on Selena in an epic battle for Earth.