Screenshots of Tom Felton from ‘The Flash’ “The Once and Future Flash” – Ep. 19 Posted on April 27, 2017 by estrella89san This week was a new episode of The Flash . You can watch Episode 19 “The Once and Future Flash” with Tom Felton here on the official site of The CW. Here are some screenshots from Episode 19 – The Once and Future Flash. More in our gallery.