We’ll have to wait a week for Arrow and Flash to stage their 2015 crossover into Legends of Tomorrow, but DC’s CW superheroes have plenty of history to tide things over. Learn Hawkgirl and Hawkman’s backstory with Vandal Savage, and catch even more action in an extended trailer for upcoming crossovers “Legends of Today” and “Legends of Yesterday.”

Following the earlier promo this week, our first full trailer for the upcoming two-night crossover delves deep into the mythology of both Hawkgirl (Ciara Renee) and Hawkman (Falk Hentschel), who themselves have been targets of Vandal Savage (Casper Crump) for ages. We also spy a bit more action, as Vandal seemingly hurls knives at everyone on the cast, while Barry hopes to take him down without our new winged friends.

So reads The Flash’s official synopsis for December 1 outing “Legends of Today,” followed on December 2 by Arrow installment “Legends of Yesterday”:

The Flash’s “Legends of Today”: 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, they turn to Barry 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 develops a serum to make Barry run faster and asks Jay (guest star Teddy Sears) to test it out.

Arrow’s “Legends of Yesterday”: Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn’t go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage.

Both Arrow and Flash will return on December 1, but what should we expect from the big Legends of Tomorrow setup?

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