Fans, beware: The finale is titled "Sacrifice," and there will certainly be a lot of that going around. Executive producer Marc Guggenheim says that the "epic" finale will feature the ultimate showdown between the Dark Archer and Oliver. "It is the fight to end all fights," he says. But the emotional stakes are also high. "It's a culmination of our season-long mythology as well as the character dynamics that really were set up in the pilot, both in terms of Moira's duplicity and the love triangle between Oliver, Laurel and Tommy." Meanwhile, back on the island, Oliver, Slade and Shado must prevent Fyres from shooting down a Ferris Air(!) plane. Plus: Expect some familiar faces to pop back up during the hour.