Arrow 7×05 “The Demon” Season 7 Episode 5 Sneak Peek #2 – FELICTY DISCOVERS A SECRET ABOUT OLIVER; CURTIS GOES UNDERCOVER — Felicity (Emily Bett Rickards) learns something new about Oliver (Stephen Amell) that shocks her. Meanwhile, Diggle (David Ramsey) asks Curtis (Echo Kellum) to go undercover for ARGUS. Dinah (Juliana Harkavy) works with an unlikely ally. Mark Bunting directed the episode written by Benjamin Raab & Deric A. Hughes (#705). Original airdate 11/12/2018.