CW Synopses December 9-13

The CW has released descriptions for the Arrowverse crossover and other shows airing that week.

The Flash s5e9 "Elseworlds: Hour One"

EPIC ELSEWORLDS CROSSOVER KICKS OFF TONIGHT — When Barry Allen (Grant Gustin) and Oliver Queen (guest star Stephen Amell) wake up one morning and realize they have swapped bodies with each other, the two set off to find out what disturbed the timeline to cause such a shift. However, things quickly go from bad to worse when they present their case to Team Flash and the gang doesn’t believe them. Barry and Oliver realize they need Supergirl’s (guest star Melissa Benoist) help and travel to Smallville on Earth-38 where they end up meeting Kara’s cousin, Clark Kent (guest star Tyler Hoechlin), and intrepid reporter, Lois Lane (guest star Elizabeth Tulloch). LaMonica Garrett guest stars as The Monitor. Kevin Tancharoen directed the episode written by Eric Wallace & Sam Chalsen (#509). Original airdate 12/9/2018.

Arrow s7e9 "Elseworlds: Hour Two"

THE ELSEWORLDS CROSSOVER CONTINUES IN GOTHAM CITY WITH BATWOMAN (RUBY ROSE) — With Oliver (Stephen Amell) and Barry (guest star Grant Gustin) still stuck in the other’s bodies, the two get a lead on John Deegan (guest star Jeremy Davies) and head to Gotham City with Supergirl (guest star Melissa Benoist) to figure out why their reality has changed. While there, they meet the mysterious Kate Kane (guest star Ruby Rose) who provides them with information that leads the group to Arkham Asylum. James Bamford directed the episode with teleplay by Marc Guggenheim and story by Caroline Dries (#709). Original airdate 12/10/2018.

Legends of Tomorrow s4e8 "Legends of To-Meow-Meow"

IT’S THE RIGHT THING TO DO — After Constantine (Matt Ryan) breaks the cardinal Legend rule, you can’t change the past, he, along with Charlie (Maisie Richardson-Sellers) and Zari (Tala Ashe) try to deal with the ramifications without telling the rest of the Legends. Even though Zari encourages them to just fix the problem, Constantine and Charlie are determined to find another way, but only continue to make things worse. Caity Lotz, Brandon Routh, Dominic Purcell, Nick Zano, Ramona Young and Jes Macallan also star. Ben Bray directed the episode written by James Eagan & Ray Utarnachitt (#408). Original airdate 12/10/2018.

Supergirl s4e9 "Elseworlds: Hour Three"

THE BATTLE CONCLUDES — Supergirl (Melissa Benoist), The Flash (guest star Grant Gustin), Green Arrow (guest star Stephen Amell) and Superman (guest star Tyler Hoechlin) engage in the battle of their lives. Jesse Warn directed the episode with story by Marc Guggenheim and teleplay by Derek Simon & Robert Rovner (#409). Original airdate 12/11/2018.

Black Lightning s2e9 "The Book of Rebellion: Chapter Two: Gift of the Magi"

DESPERATE – After Jennifer (China Anne McClain) and Khalil (Jordan Calloway) escape, they take refuge in a barn and Jennifer desperately tries to save a now feverish Khalil, who has grown worse from Cutter’s poisonous blade. Meanwhile, Jefferson (Cress Williams), Lynn (Christine Adams) and Anissa (Nafessa Williams) try everything they can to track down Jennifer and Khalil. Damon Gupton, Marvin Jones III and James Remar also star. Benny Boom directed the episode written by Adam Giaudrone (#209). Original airdate 12/11/2018.

Supernatural s14e9 "The Spear"

THE BEST LAID PLANS – Sam (Jared Padalecki) and Dean (Jensen Ackles) enlist the help of their pal Garth (guest star DJ Qualls) to gain inside information on what Michael may be planning. The brothers split up to each go after weapons that can aid in their fight against the Archangel, but this may be a fight our heroes cannot win. The episode was directed by Amyn Kaderali and written by Robert Berens (#1409). Original Airdate 12/13/2018.