Watch: The Flash "Legends Of Today" Preview

Watch the preview for the first part of the upcoming crossover with The Flash, Arrow and DC’s Legends of Tomorrow.

Update: A “Heroes Join Forces” promo has also been released.

The Flash takes a week off for Thanksgiving and returns Tuesday, December 1st.

Episode synopsis:

PART ONE OF THE EPIC CROSSOVER WITH “ARROW” — In its second major crossover event with “Arrow,” Vandal Savage (guest star Casper Crump) arrives in Central City and sets his sights on Kendra Saunders (guest star Ciara Renée). After Vandal attacks Kendra and Cisco (Carlos Valdes), they turn to Barry (Grant Gustin) for help. Realizing how dangerous Vandal is, Barry takes Kendra to Star City and asks Oliver and team to hide her until he can figure out how to stop Vandal. However, things quickly go from bad to worse when a man with wings AKA Hawkman (guest star Falk Hentschel) shows up and flies off with Kendra. Meanwhile, Harrison (Tom Cavanagh) develops a serum to make Barry run faster and asks Jay (guest star Teddy Sears) to test it out. Ralph Hemecker directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Aaron Helbing & Todd Helbing (#208). Original airdate 12/1/2015.

“The Flash” airs on the CW Tuesdays at 8pm ET starring Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Tom Cavanagh and Jesse L. Martin.