With a new ally on his team, Oliver engages Diaz in an epic final battle.

The pressure mounts for Oliver who begins to wonder if he will lose everything in his battle to save Star City. A familiar face returns.

Diaz targets Team Arrow and their loved ones. Oliver struggles with Felicity putting herself in danger when she gets the chance to stop Diaz for good.

Oliver and Thea are shocked to hear that Roy Harper is back in Star City. However, when they discover the circumstances of Roy’s return, Oliver and Thea realize that Roy…

Max must break her vow to avoid Logan after Joshua’s friendship with the blind woman makes him a target of a transgenic manhunt in the sewers. Meanwhile, White leaks news…

Zack reappears and tells Max Lydecker has captured Brin, one of their Manticore sisters, and plans to do her harm. Max decides they must kidnap Lydecker and force him to…

Sheppard’s team meets a civilization about to be destroyed by a super-volcano, and is trapped there when the Stargate is destroyed during the evacuation.

Shawn and Gus must prove Lassiter’s innocence when he’s on the hook for a murder inside of the Santa Barbara Police Department.

SG-1 discovers a military camp where young men are trained to impersonate SGC personnel to infiltrate Earth.