The episode introduces us to the series version of Jax-Ur, a long time character in the Superman mythos.
Jax-Ur was a scientist and colleague of Jor-El that we first met in Adventure Comics #289 (1961) by Otto Binder and George Papp He built a nuclear missile and tried to test it by blowing up an asteroid,[...]
Jax-Ur Archives
Hannah Waddingham, who played the 'shame' shouting, bell-ringing Septa Unella in Game of Thrones, has joined that cast to play Jax-Ur.
Credit: Hilary (Into The Woods) [CC BY 2.0], via Wikimedia CommonsThe studios described the new character as: "Formerly one of Krypton's greatest scientists with deep ties to Krypton's past, Jax-Ur is now determined to bring[...]