While The CW busies itself with other announcements, we're less than a week away from 'Arrow's' first season finale "Sacrifice," culminating the season-long Undertaking arc and finally pitting Oliver Queen against Malcolm Merlyn (John Barrowman), but how much epic action can we expect? Check out 'Arrow's' full-length season finale trailer to find out inside!

And so, it has all come down to this. May 15 will see The CW's 'Arrow' airing its first season finale "Sacrifice" and the official trailer for the season closer more than delivers on the epic scope we've been promised. Not only does Oliver finally face off against Malcolm Merlyn's Dark Archer, but so too does "The Undertaking" come to fruition to put all of Starling City's Glades in jeopardy.

Entertainment Weekly obtained the first look at the full-length trailer, which features some surprisingly spoiler-y moments including a big confession from Moira Queen, and another tense showdown between Oliver and jilted best friend Tommy Merlyn, and that's just the present! Past Oliver will have plenty of his own to deal with, stopping Edward Fyers from shooting down a Ferris aircraft and crippling China's economy. And be sure to expect plenty of surprise moments and setups for future 'Arrow' stories as well!

Well, what are you waiting for? Check out the full trailer for 'Arrow's' first season finale "Sacrifice" below, and give us your predictions in the comments! What DC characters do you think will be teased before 'Arrow' season 1 bows?

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