CW Synopses October 21-25

The CW has released descriptions for their episodes premiering the week of October 21.

Supergirl s4e2 "Fallout"

CHAOS IN NATIONAL CITY — A shocking revelation causes chaos in National City. Supergirl (Melissa Benoist) sets out to capture Mercy Graves (guest star Rhona Mitra), while Alex (Chyler Leigh) takes control at the DEO. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena (Katie McGrath) if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy (Jesse Rath) meets Nia (Nicole Maines) and the two end up in a precarious situation. Harry Jierjian directed the episode with story by Dana Horgan and teleplay by Maria Maggenti & Daniel Beaty (#402). Original airdate 10/21/2018.

Arrow s7e2 "The Longbow Hunters"

FELICITY IS DETERMINED TO FIND DIAZ AT ANY COST — In order to track down Diaz (Kirk Acevedo) from inside prison, Oliver (Stephen Amell) realizes that will require aligning with an old enemy. Meanwhile, in Star City, Felicity’s (Emily Bett Rickards) attempts to root out Diaz are thwarted by Diggle (David Ramsey), whose allegiance to ARGUS now requires him to keep civilians like her on the outs. Realizing that she can no longer rely on her old team or old methods, a clear-eyed Felicity resolves to find a new way to go after Diaz. Laura Belsey directed the episode written by Jill Blankenship & Rebecca Bellotto (#702). Original airdate 10/22/2018.

Legends of Tomorrow s4e1 "The Virgin Gary"

IT’S ALL MAGICAL — After the Legends defeated Mallus and wiped the final anachronism from time, they find themselves in unfamiliar territory with the Time Bureau. All that changes when Constantine (Matt Ryan) informs Sara (Caity Lotz) of a new magical threat that leads the team to Woodstock. Constantine thinks he knows how to defeat the new threat, but will need the help of the team and their special klepto talents to help with his spell. Meanwhile, Nate (Nick Zano) and Rory (Dominic Purcell) go on an adventure leaving Nate facing someone from his past. Brandon Routh, Tala Ashe, Jes Macallan and Courtney Ford also star. Gregory Smith directed the episode written by Phil Klemmer & Grainne Godfree (#401). Original airdate 10/22/2018.

The Flash s5e3 "The Death of Vibe"

CICADA TARGETS A MEMBER OF TEAM FLASH — After Cicada’s (Chris Klein) attack on The Flash (Grant Gustin), the team realizes they need to think outside the box to stop this dangerous new foe. Desperate to help her parents, Nora (Jessica Parker Kennedy) comes up with a plan that ultimately puts a member of Team Flash in danger. Meanwhile, Caitlin (Danielle Panabaker) delves into her past. Andi Armaganian directed the episode written by Jonathan Butler & Gabriel Garza (#503). Original airdate 10/23/2018.

Black Lightning s2e3 "The Book of Consequences: Chapter Three: Master Lowry"

CHANGES –Jefferson (Cress Williams) is forced to watch as all his good work is undone before his eyes when his replacement arrives and begins implementing sweeping changes. Meanwhile, Anissa (Nafessa Williams) continues to play Robin Hood by stealing from one of the most powerful crime syndicates in Freeland. China Anne McClain, Christine Adams, Marvin Jones III, Damon Gupton, Jordan Calloway and James Remar also star. Rose Troche directed the episode written by Jan Nash (#203). Original airdate 10/23/2018.

Supernatural s14e3 "The Scar"

KIM RHODES RETURNS AS SHERIFF JODY MILLS – Still trying to solve the mystery of what happened to Dean (Jensen Ackles), Sam (Jared Padalecki) enlists the help of Sheriff Jody Mills (Kim Rhodes) who may unknowingly already be on the case. Castiel (Misha Collins) continues to be a father figure to Jack (Alexander Calvert), who surprises even himself, when a life is on the line. Robert Singer directed the episode written by Robert Berens. (#1403). Original Airdate 10/25/2018.