In "A.W.O.L.", an upcoming episode of "Arrow," Shadowspire arrives in Star City and John Diggle must learn more about his brother Andy's past in order to overcome them. Additionally, Oliver has to make some changes in his life, which may have something to do with Felicity's fate following the events of "Dark Waters."

"A.W.O.L." -- (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV)

DIGGLE VS. SHADOWSPIRE -- Diggle (David Ramsey) must learn to trust his brother Andy (guest star Eugene Byrd) when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver (Stephen Amell) has to learn a whole new way of life. Charlotte Brandstrom directed the episode.

Starring Stephen Amell, Neal McDonough, David Ramsey and Emily Bett Rickards, "Arrow" returns to The CW on Wednesday, January 20 at 8/7C.