"The only way that we make it out of here is if we trust each other."
"We've been through worse, Oliver."
"I'm not sure that we have, John.
Oliver Queen and John Diggle
"Brothers in Arms" is the seventeenth episode of the sixth season of Arrow, and the one-hundred-thirty-second episode overall. It aired on April 5, 2018.


Oliver and Diggle face their biggest challenge yet. Curtis is disappointed to find out his new boyfriend has a firm anti-vigilante stance.[1]


  • The title refers to the fractured relationship between Oliver and Diggle.
  • This episode marks the first to not credit Willa Holland in the main cast bill since her departure in the previous episode.
  • Kirk Acevedo, Audrey Marie Anderson and Tina Huang previously appeared in the Law & Order franchise.
  • Stephen Amell, Katie Cassidy, Audrey Marie Anderson and Tina Huang each had a role in the Beverly Hills, 90210 franchise. Anderson appeared on Beverly Hills, 90210 while Amell and Huang both appeared on 90210, and Cassidy was once a series regular in the short-lived Melrose Place reboot.
  • Audrey Marie Anderson, Tina Huang and Pej Vahdat previously made an appearance on House. In addition, Huang and Vahdat each appeared on Castle and The Unit. Both shows featured a guest appearance from Audrey Marie Anderson.




  1. Arrow - Episode 6.17 - Brothers In Arms - Promo, Promotional Photos + Press Release - SpoilerTV