Joe Morton and Robin Wright reprises their roles as Dr. Silas Stone, a scientist at S.T.A.R. Labs and Victor Stone's father, and as General Antiope, Hippolyta's sister and Diana's aunt/mentor, from "Batman v Superman: Dawn of Justice" and "Wonder Woman", respectively. Amber Heard, Billy Crudup, and Kiersey Clemons will portray Mera, Dr. Henry Allen, and Iris West, respectively. Julian Lewis Jones and Michael McElhatton have been cast in undisclosed roles.