ARROW: Brothers in Arms Preview 

OLIVER MAKES A DARING MOVE THAT COULD COST HIM EVERYTHING —  Oliver (Stephen Amell) and Diggle (David Ramsey) face their biggest challenge yet.   Curtis (Echo Kellum) is disappointed to find out his new boyfriend has a firm anti-vigilante stance.  Mark Bunting directed the episode written by Sarah Tarkoff & Jeane Wong (#617).  (9:00-10:00 p.m. ET)

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