The CW adds Sunday nights to its line up, starting October 14 with the series premiere of its “Charmed” remake and season 4 of “Supergirl.” The CW kicks off its new fall season with “The Flash” and “Black Lightning” on October 9. Other fan favorites are set to premiere the same week with new series “All American” airing after “Supernatural” on October 11.

'Supergirl' to introduce new characters

“Supergirl” season 3 left off with a surprise result of Kara's battle with Reign: a doppelganger who was last seen in Russia.

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This toys with a storyline from the comic books where Supergirl was raised in Russia, becoming their hero. Little else has been revealed about the plans for the new character.

Season 3 saw the departures of Chris Wood as Mon-El, Jeremy Jordan as Winn (who has been confirmed as returning at some point), and Odette Annable as Reign.

Jesse Rath joins the cast full time as Brainy who takes the place of Winn. This year's crossover will feature exciting new characters: Batwoman played by Ruby Rose and the introduction of Lois Lane played by Elizabeth Tulloch (Grimm). The crossover event will also see the return of Tyler Hoechlin as Clark Kent.

“Supergirl” will also introduce TV's first trans superhero, Nia Nal, played by Nicole Maines. Nia is a reporter at CatCo who works alongside Kara. Sam Witwer (Smallville) joins the cast as Agent Liberty, the leader of the Children of Liberty which is described as a hate group believing in humans first. David Ajala joins “Supergirl” as Manchester Black, the psychic and telekinetic leader of a self-styled group of superheroes known as the Elite.

This season will also feature April Parker Jones as Colonel Haley, Rhonda Mitra as Mercy Graves (Lex Luther's former bodyguard), and Robert Baker as Mercy's brother Otis.

Season 4 will be more grounded than the show was in the past, with more topical stories covered. Melissa Benoist explains to Deadline these stories will mirror situations happening in the world today and in our country. Fear itself will serve as a villain with the characters fighting against an anti-alien sentiment which will involve Agent Liberty. Benoist shares the characters will explore whether or not hope can conquer this fear. Chyler Leigh teased during San Diego Comic-Con, the debate of the DEO using lethal weapons could return this season. This is likely due to Alex's recent promotion to head of the DEO.

Meeting the new Charmed Ones

The “Charmed” reboot got mixed feelings from fans and even original cast member Holly Marie Combs has wavered on her opinion of the remake. The series has a modern update with winks to the original series that can be found throughout but stands on its own away from the original.

The new “Charmed” will maintain the same story on the surface about three sisters who discover they're witches called the Charmed Ones, and who must learn to use their newfound powers to vanquish demons. The sisters will struggle to balance relationships with their newfound supernatural status. The series stars Madeleine Mantock, Melonie Diaz, and Sarah Jeffery as the new sisters.

Many changes are in store for “Charmed,” starting with the new setting of a fictional college town. The college will play a key part in the season as two of the sisters attend and their Whitelighter serves as a professor. The pilot “Stronger Together” finds sisters Mel (Diaz) and Maggie (Jeffery) in different stages of their lives. Mel is a graduate student studying women's studies while Maggie is a freshman focusing on sorority life and navigating her on-and-off relationship with Brian. After their mother dies, Mel is determined to find answers, but her search is derailed by the discovery of a third sister when Macy (Montock) shows up on their doorstep.

The three sisters have powers similar to the original Charmed Ones: Macy is a geneticist with telekinesis, Mel is an activist with the ability to freeze time, and Maggie is a college student whose powers deter from the original series with the ability to hear thoughts. The series will explore their various relationships in a similar way the original series did with the sisters having complicated love lives. Their love interests were already announced. Ellen Tamaki plays Nico Hamada who is a detective. Their relationship is presumed to feature complications similar to what Andy and Prue had in the original series. Charlie Gillespie plays Brian who is the sometimes boyfriend of Maggie. Ser'Darius Blain plays Macy's boyfriend Galvin who is a filmmaker described as the ideal boyfriend. The series also stars Rupert Evans as Harry Greenwood who fills the place as the sisters' Whitelighter and professor with an infuriating charm.

The recent trailer revealed a connection to the original series that left the fans talking. A quick look at the sisters' book of shadows shows a familiar name many fans will recognize: Melinda Warren. The original Charmed Ones had an ancestor named Melinda Warren who is credited with being where their magical lineage began. This has left fans wondering if this means the Halliwell sisters could exist in this world. The trailer also gave quick glances of various demons which includes the brief look at an evil dog and the sisters clutching hands in a way fans will immediately recognize. The first bad guy for the series has been revealed as CEO Alastair Caine.

The pilot of "Charmed" will air following the first episode of "Supergirl" season 4 on October 14.