Arrow Preview: John Barrowman Returns; Plus, Oliver and Diggle Are At Odds

Oliver struggled with putting his hood back on in this week's return of Arrow.  But when Laurel's co-worker lost her firefighter brother due to a mysterious fire, Laurel reached out to the Arrow and he grudgingly got back to work, discovering that one of the former firefighters from his squad (who had been presumed dead) was taking vengeance on the co-workers he thought had left him to die.  Oliver confessed to Diggle that he was afraid of what might happen to his loved ones if he died now, but Diggle thought that his relationships were an advantage, not a liability.  When the rogue firefighter crashed a benefit that Tommy was throwing, the Arrow stepped in and tried to convince him to give up on his vengeance.  The man refused, choosing to burn up instead, but the Arrow is now seen as a hero in Starling City.

Back home at the Queen mansion, Moira had been moping for weeks after Walter's disappearance and Thea tried everything she could in order to get her mother out of her funk.  While Moira resisted, she eventually decided to step into Walter's role in the company.

In next week's episode, Oliver and Diggle face off when Oliver goes after a name on his list that just so happens to be Diggle's former commanding officer in Afghanistan.  Diggle doesn't believe his friend is guilty, so he goes undercover at his security company to prove Oliver wrong.  Back at the Queen mansion, Thea is worried that Moira is having an affair with Malcolm Merlyn.

Watch a preview below for the January 23 episode of Arrow on The CW.