Casting the characters for Captain America: Serpent Society in the MCU. The film takes place after Captain America: The Winter Soldier and before Captain America: Civil War. In the post-credits scene, Viper, a.k.a Madame Hydra, recruits the Serpent Society into a new "Hydra". It is called a Secret Society and a Secret Empire, but its true name is that of another great beast. This new organization is Leviathan.
