WEDNESDAY, APRIL 19
"Checkmate" - (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV)
OLIVER SEEKS THE TRUTH - Oliver (Stephen Amell) gets closer to the truth about Prometheus. Meanwhile, Helix refuses to continue helping Felicity (Emily Bett Rickards) until she does a favor for them. Ken Shane directed the episode written by Beth Schwartz & Sarah Tarkoff (#516). Original airdate 3/15/2017.