The Season 2 adventures of Arrow (based on DC Comics hero Green Arrow) begin with Oliver Queen (Stephen Amell) returning to Starling City after the Undertaking and discovering that things are in worse shape than he imagined. Oliver's major foe is Slade Wilson (Manu Bennett), who becomes the villainous Deathstroke after being injected with the strength-inducing serum mirakuru. Slade wants to kill Oliver because he blames him for Shado's death on the island. But he's not the only thug who causes trouble for either Oliver or Arrow. Oliver gets into a heated battle with China White (Kelly Hu) and Bronze Tiger (Michael Jai White) over stolen medical supplies. Shrapnel (Sean Maher) sets off bombs in Starling City. The Clock King (Robert Knepper) opens bank vaults using advanced technology. The Huntress (Jessica De Gouw) returns and takes hostages at the courthouse when her father is arrested. And the League of Assassins target Oliver and Canary (Caity Lotz). Elsewhere, Laurel (Katie Cassidy) fears for her job when Sebastian Blood (Kevin Alejandro) exposes her drug addiction; and Diggle (David Ramsey) pursues Deadshot (Michael Rowe) in Russia.