Duke's parents Max and Connie Hauser are voiced by Michael Bell and B.J. Ward, who voiced Duke and Scarlett in G.I. Joe (1985).
Duke's brother Vincent Hauser, is traditionally known as Lt. Falcon in the G.I. Joe saga. He is called Falcon due to his being Duke's half-brother and having the name of Vincent R. Falcone; in this show however he is Duke's full-blooded brother.