The Flash airs at 8pm EST, with Legends of Tomorrow at 9pm EST.
The Flash "Luck Be A Lady" synopsis:
Barry (Grant Gustin) and the team are hit by a string of bad luck and realize it is the handiwork of a new meta, Becky (guest star Sugar-Lyn Beard) nicknamed Hazard, who has the ability to give others bad luck, while cashing in the benefits for herself. Meanwhile, Harry Wells (Tom Cavanagh) returns to Earth-1 to give Wally (Keiynan Lonsdale) a message from Jesse. Armen V. Kevorkian directed the episode written by Sam Chalsen & Judalina Neira (#403). Original airdate 10/24/2017.
Legends of Tomorrow "Zari" synopsis:
When Sara (Caity Lotz) receives a distress call from their “befriended” agent at the Time Bureau, she learns that they have been tasked with going to the future to capture a rogue time traveler. Unfortunately, the Legends make things worse by trying to protect an outlaw named Zari (Tala Ashe), to hopefully lure in the time travelling assassin. Meanwhile, Stein (Victor Garber) tries to diagnose Amaya’s (Maisie Richardson-Sellers) condition, but Nate (Nick Zano) discovers an unusual treatment that Amaya begrudgingly agrees to. Brandon Routh, Dominic Purcell and Franz Drameh also star. Mairzee Almas directed the episode written by James Eagan & Ray Utarnachitt (#303). Original airdate 10/24/2017.