Arrow 5×15 “Fighting Fire with Fire” Season 5 Episode 15 Sneak Peek – VIGILANTE ATTACKS MAYOR QUEEN — Oliver (Stephen Amell) faces his biggest challenge yet as mayor. Felicity (Emily Bett Rickards) continues down her dark path with Helix. After Vigilante attacks Oliver while he’s acting as the mayor, Diggle (David Ramsey) leads the team in a mission to stop Vigilante once and for all. Michael Schultz directed the episode written by Speed Weed & Ben Sokolowski (#515). Original airdate 3/1/2017.