VIDEO: Sneak Peek - Season Finale of The CW's ARROW

On the Season Finale of The CW's ARROW titled 'Sacrifice', Oliver (Stephen Amell) and Diggle (David Ramsey) race to stop the Dark Archer (John Barrowman) from unleashing his vengeance on The Glades. However, they run into a roadblock after Detective Lance (Paul Blackthorne) picks up Felicity for questioning.

Tommy (Colin Donnell) and Oliver's already tumultuous relationship takes a turn for the worse after Oliver makes a confession about Laurel (Katie Cassidy). After hearing of the danger in The Glades, Thea (Willa Holland) races to find Roy (Colton Haynes), inadvertently putting herself directly in the line of fire for Malcolm's (John Barrowman) devious plan.

On the island, Oliver, Slade (Manu Bennett) and Shado (guest star Celina Jade) are locked in a life-or-death struggle against Fyers (guest star Sebastian Dunn) as his missiles lock on a full Ferris Air jetliner.

Susanna Thompson also stars. David Barrett directed the episode with the teleplay written by Marc Guggenheim & Andrew Kreisberg and story by Greg Berlanti