(W) Joshua Williamson (A) Jesus Merino & Various (CA) Carmine Di Giandomenico. "SINS OF THE FATHER" finale! Wally's quest for knowledge about his villainous father takes him and Barry Allen to the Australian outback and into the debt of Captain Boomerang* one of The Flash's oldest enemies and the last person to see Wally's father* Reverse-Flash* alive.