About Arrow Season 4, Episode 15 : Taken

Damien demands that Oliver resign as a mayoral candidate, or he will kill William. In response, Oliver brings in a superhuman ally, Vixen, to help him track down his son. Guest Stars: Neal McDonough, Megalyn Echikunwoke, Elysia Rotaru, Ryan Robbins, Nickolas Baric, Fraser Corbett, Justin Doran, Parker Young, Jimmy Akingbola, Chenier Hundal, Anna Hopkins, Jack Moore,