New Extended Promo For ARROW Season 2 Finale: "Unthinkable"

OLIVER MUST DECIDE ONCE AND FOR ALL IF HE'S A KILLER OR A HERO - Slade (Manu Bennett) moves forward with his plan to kill one more person in Oliver's (Stephen Amell) life. While Oliver has fought all year to be more than the killer he once was, when Slade kidnaps someone close to Oliver's heart, Oliver is pushed to the edge and realizes sometimes it takes doing the unthinkable to stop the monster. Meanwhile, Diggle (David Ramsey) takes on Amanda Waller (guest star Cynthia Addai-Robinson) with a little help from some friends, and Thea (Willa Holland) turns to Roy (Colton Haynes) in her time of need. John Behring directed the episode with story by Greg Berlanti and teleplay by Marc Guggenheim & Andrew Kreisberg

Arrow is a modern retelling of the DC Comic character Green Arrow. Multi-millionaire playboy Oliver Queen is missing, and presumed dead after a shipwreck at sea. He is found five years later, having survived on a desert island off his wits and by mastering the bow and arrow. When he returns to Starling City however, he discovers that it is rife with corruption and crime. Oliver decides to put his skills to use by taking on the persona of Arrow and becoming the vigilante that Starling City needs.