We know that Arrow and The Flash will be crossing over this year before their respective mid-season finales, but the worlds of Oliver Queen and Barry Allen will continue to clash as characters from each series jump between Starling City and Central City. TV Line reveals that Robert Knepper will reprise the role of William Tockman (better known to comic book fans as The Clock King) in episode 7 of The Flash, but he won't be alone!executive producer Andrew Kreisberg told the site, adding that Barry will beThere's no word on who that villain will be as of right now. What do you guys think?