Sneak Peek footage, images and synopsis from the "Arrow" episode "Checkmate", written by Beth Schwartz, Sarah Tarkoff and directed by Ken Shane, airing March 15, 2017 on The CW:
"...when 'Talia al Ghul' pays a visit to 'Oliver', he questions her about her student 'Prometheus' which leaves him with shocking revelations.
"Meanwhile, 'Helix' refuses to continue helping 'Felicity' until she does a favor for them..."
Click the images to enlarge and Sneak Peek "Arrow: Checkmate"...