Tom Cavanagh is back in the director’s chair on “The Flash.”According to HollywoodNorth.buzz, Cavanagh is directing Season 4, episode 4 of the CW series. The 53-year-old actor, who plays several versions of Harrison Wells on the show, was spotted directing his co-stars Grant Gustin (Barry Allen) and Candice Patton (Iris West) in a downtown Vancouver alley earlier this week.