There’s no denying that Arrow Season 4 and The Flash Season 2 have spent plenty of time laying groundwork for 2016's Legends of Tomorrow, and all that effort may finally pay off by the upcoming December crossover. Meet Vandal Savage, as The CW unleashes its full synopses for both hours of either series, including The Flash’s “Legends of Today” and Arrow’s “Legends of Yesterday”!

The CW released a full synopsis of either crossover episode, in which Casper Crump’s Vandal Savage finally makes his presence known, taking aim at our new Hawkgirl, Kendra Saunders. We caught a glimpse of the big team-up in a recent photo, but it appears as if the crossover itself will generate some impressive scope:

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.

You’ll notice at least a few names absent from said descriptions, including Sara Lance, Captain Cold, Heat Wave, either half of Firestorm, and especially Rip Hunter, but it remains to be seen how in-depth either Arrow or The Flash intend to go with the 2016 spinoff. The crossover installments will air on Dec. 2 and 3, so check out the latest trailers in the meantime.

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