Heroes will be forged. And sacrifices will be made.

So teases The CW in its official synopsis for next week's Arrow Season 1 finale, as Oliver and Diggle race to stop The Dark Archer from unleashing his wrath on The Glades.

Elsewhere, Tommy's friendship with Oliver will take a turn for the worse, while Thea goes off in search of Roy and Oliver gets locked in a struggle with Slade and Shado on the island.

Check out Arrow photos from the finale now and then watch the following promo for "Sacrifice."

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.