Ep 8. Legends of Yesterday

In Season 4, Episode 8 of Arrow, titled "Legends of Yesterday," the crossover event with The Flash begins. Oliver and Barry Allen travel back in time to Central City to seek out Vandal Savage, the immortal villain who is threatening the world with destruction. Along the way, they encounter many challenges and obstacles that test both their physical abilities and their inner strength.

As the episode opens, Oliver and Barry are training in the snow. Oliver is teaching Barry how to shoot a bow and arrow, but he's having trouble hitting the target. Meanwhile, back in Star City, Diggle is on a mission to find out the identity of the person who killed his brother, but he's not having much luck.

When Oliver and Barry arrive in Central City, they quickly realize that things are not what they seem. They meet up with Barry's team at S.T.A.R. Labs, and find out that Vandal Savage is in town. They also discover that he's after an artifact that is currently in the possession of Kendra Saunders, who is a barista at Jitters.

Kendra is initially reluctant to help Oliver and Barry, but after they convince her that she is the only one who can save the world, she agrees to go with them. They travel back in time to ancient Egypt, where they find out that Kendra and Carter Hall, aka Hawkman, were once lovers. Hawkman is also after Vandal Savage, and the three of them team up to defeat him.

As they travel back to the present day, Vandal Savage continues to be a threat, and they struggle to keep him at bay. Meanwhile, Diggle is getting closer to discovering the identity of his brother's killer, and Felicity is dealing with her own struggles after the events of the previous episode.

The action is non-stop in "Legends of Yesterday," with plenty of fight scenes, explosions, and special effects. The episode also features emotional moments, including a heartwarming scene between Oliver and Felicity, as well as a touching reunion between Kendra and Carter.

Ultimately, the crossover event between Arrow and The Flash sets the stage for the upcoming spinoff series, Legends of Tomorrow. The episode ends on a cliffhanger, leaving viewers eagerly anticipating the next installment in the ongoing saga of Oliver Queen and his team of heroes.