'The Flash' Season 2 Spoilers: Hawkman Challenges Barry To Stop Vandal Savage In Sneak Peek Of 'Arrow' Crossover Episode [VIDEO]

Episode 8 of "The Flash" Season 2, "Legends of Today," the first of the CW's big crossover episodes between "The Flash" and "Arrow" this week, will be a very busy hour of television. In addition to juggling the two show's not-at-all-simple universes, the episode will also have the tall order of introducing the network's new spinoff, "Legends of Tomorrow," which is set to premiere on the CW Jan. 21. That means new heroes, new villains and a whole lot of new information for fans to digest. Even Barry (Grant Gustin) is having trouble keeping up with everything. Luckily, a sneak-peek video from the new episode reveals that Hawkman is around to set everybody straight.

In the sneak-peek video, there seems to be a misunderstanding between the new hero and future "Legends of Tomorrow" star Hawkman (Falk Hentschel) and the S.T.A.R. Labs team. The new superhero is shown all tied up and being interrogated by Barry and his Starling City cohorts from "Arrow," including Oliver Queen (Stephen Amell) -- Oliver has evidently showed up to help out with a new bad guy. Who is the new bad guy? Hawkman has the low-down.

Hawkman explains that there is a new baddie in town named Vandal Savage (Casper Crump), an immortal villain who spends his endless days hunting down Hawkman and his eternal love, Hawkgirl. Speaking of Hawkgirl, Kendra Saunders (Ciara Renée) is there too. Hawkman, whose real name is Carter Hall, explains that the pair are reincarnated each time Savage kills them. Hall says only he and Kendra stand a shot at facing Savage, but Barry and Oliver point out that Hawkman and Hawkgirl's previous selves do not exactly have the best success rate. Hall challenges the heroes to do better.

Watch the sneak peek from "Legends of Today" below:

"Legends of Tomorrow" brings together a group of heroes and villains from the "Arrow" and "The Flash" universes, including Firestorm (Victor Garber), Ray Palmer (Brandon Routh), Captain Cold (Wentworth Miller), and Sara Lance (Caity Lotz), in addition to Hawkman and Hawkgirl, for a fight that is bigger that the group's surface differences. The group is assembled by time traveler Rip Hunter (Arthur Darvill) to take on Savage who plans to destroy the world. The series, created by "The Flash" and "Arrow" vets Greg Berlanti, Andrew Kreisberg, and Marc Guggenheim, is said to have a similar tone to "The Flash," as opposed to "Arrow."

Can Barry and Oliver stop Vandal Savage? Fans will have to wait to find out. "The Flash" airs Tuesdays at 8 p.m. EST on the CW.