The biggest event in the Arrow-verse is almost here! "Crisis on Earth X" airs:
Monday, November 27th
7pm Supergirl "Part 1"
8pm Arrow "Part 2"
Tuesday, November 28th
7pm The Flash "Part 3"
8pm DC's Legends Of Tomorrow "Part 4"
Here's the official description for part 1 - I have the descriptions for parts 2-4, but don't want to spoil anything for y'all ...
MONDAY, NOVEMBER 27
“Crisis on Earth-X, Part 1” — (7:00-8:00 p.m. CST)
THE EPIC FOUR-WAY CROSSOVER WITH “ARROW,” “SUPERGIRL,” “THE FLASH” AND “DC’S LEGENDS OF TOMORROW” BEGINS — Barry (guest star Grant Gustin) and Iris’s (guest star Candice Patton) wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold (guest star Wentworth Miller), The Ray (guest star Russell Tovey), Felicity Smoak (guest star Emily Bett Rickards), Iris West and Alex Danvers (Chyler Leigh) to take on their most formidable villains yet. Earth’s mightiest heroes – Green Arrow (guest star Stephen Amell), Supergirl (Melissa Benoist), The Flash (guest star Grant Gustin) and White Canary (guest star Caity Lotz) – lead their teams into battle to save the world. Larry Teng directed the episode with story by Andrew Kreisberg & Marc Guggenheim and teleplay by Robert Rovner & Jessica Queller (#308). Original airdate 11/27/2017.
Here's the extended trailer:
And, another look with star commentary: