John Diggle’s sons will clash in the final season of Arrow.

The CW superhero drama has cast new series regular Charlie Barnett (Russian Doll) as the adult version of John Diggle Jr., a.k.a. J.J., the son of Diggle (David Ramsey) and Lyla (Audrey Marie Anderson). Last season Arrow revealed that there’s a rift between J.J., who is now the leader of the Deathstroke Gang, and his adopted brother Connor Hawke (Joseph David-Jones) and their father.