Arrow season 3
Oliver fights Ra's al Ghul in the midseason finaleThe CW (official stills)

Arrow Season 3 returns on 21st January with 2015's first episode titled Left Behind and going by the official synopsis, it looks like the episode will address Oliver's fate after the shocking and deadly outcome of the mid-season finale.

Check out the synopsis below:

"THE TEAM DEALS WITH OLIVER'S DISAPPEARANCE — In the aftermath of Oliver's (Stephen Amell) fight with Ra's al Ghul (Matt Nable), Diggle (David Ramsey) and Arsenal (Colton Haynes) continue to protect the city in the Arrow's absence.

However, after three days without hearing from Oliver, they begin to fear the worst may have happened to their friend. Felicity (Emily Bett Rickards) refuses to believe that Oliver could be dead until Merlyn (John Barrowman) pays the team a surprise visit. Thea (Willa Holland) suspects there is something more behind Oliver's disappearance and asks Merlyn for a favor.

Meanwhile, Ray (Brandon Routh) tests a part of his new suit and Laurel (Katie Cassidy) takes up the mantle of the Black Canary."

In the mid-season finale episode of Arrow season 3, Oliver Queen suffered a brutal defeat at the hands of Ra's al Ghul when the villain stabbed him with a sword before pushing him off a cliff.

The upcoming episode promises to shed some light on Oliver's resurrection and return to Starling City. Apart from that, fans will get to see Team Arrow in action and also the first look at Ray Palmer's Atom should be pretty cool.

Arrow season 3
Ray Palmer will test his A.T.O.M suit in upcoming episodearrow.wikia.com

Arrow season 3, episode 10 Left Behind airs 21st January 2015 on The CW.