'Arrow' executive producer talks 'possibilities' of the Flash

The CW's superhero series "Arrow" was one of the network's success stories from last season, and it returns for Season 2 on Wednesday night to a TV show landscape that's slowly filling with more comic book properties, including "Marvel's Agents of S.H.I.E.L.D." on ABC and a possible "Flash" series that might be spun out of "Arrow."