Supernatural airs Thursdays at 8pm EST followed by Arrow at 9pm EST.
Supernatural "Breakdown" synopsis:
Donna (guest star Briana Buckmaster) calls Sam (Jared Padalecki) and Dean (Jensen Ackles) for help after her niece, Wendy (guest star Sarah Dugdale), goes missing. The three hunters discover Wendy was kidnapped by a man who sells human parts to monsters in a grotesque online auction and race to save her before it is too late. Amyn Kaderali directed the episode written by Davy Perez (#1311). Original airdate 1/25/2018.
Arrow "We Fall" synopsis:
WILLIAM LANDS IN CAYDEN JAMES’ CROSSHAIRS — Cayden James (guest star Michael Emerson) ups the ante by launching his plan to take control of every aspect of the city. Despite the scope of Cayden’s plan, Oliver (Stephen Amell) is determined to foil it with just the Original Team Arrow – and without the aid of Rene (Rick Gonzalez), Dinah (Juliana Harkavy), or Curtis (Echo Kellum). But things get complicated when William (guest star Jack Moore) is endangered as a result of Cayden’s handiwork. Wendey Stanzler directed the episode written by Speed Weed & Spiro Skentzos (#611). Original airdate 1/25/2018.