Finally, the much awaited TV show, "Legends of Tomorrow" will finally kick-off when the eighth episode of "The Flash" and "Arrow" commence.

The two part spin-off will serve as a prelude to the series and the first part will be the eight episode of "The Flash" while the continuation will be the eighth episode of "Arrow."

Vandal Savage will finally make his debut and he is on the hunt for Kendra Saunders, also known as Hawkgirl. Kendra Saunders will be on a date with Cisco when the powerful adversary arrives.

Also, Hawkman will make his debut and it will take the combined effort of Team Flash and Green Arrow to stop him. Here's the premise of part 1 via "The Flash" season 2 episode guide wikia.

"Vandal Savage arrives in Central City and sets his sights on Kendra Saunders. 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, also known as Hawk-Man shows up and flies off with Kendra. Meanwhile, Harrison develops a serum to make Barry run faster and asks Jay to test it out."

Meanwhile, here's the continuation of the cross-over episode via "Arrow" wikia.

"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."