As Kripke put it, "We had the empire, but we didn't really have the rebellion." They had always wanted to have a storyline with a few central characters but having massive battles in the background, comparable to Star Wars and Lord of the Rings, and the addition of angels allowed for this.
Balthazar, portrayed by Sebastian Roché, is an angel who had fought alongside Castiel during the last angelic war.
The show features two main characters, Jared Padalecki as Sam Winchester and Jensen Ackles as Dean Winchester, brothers who travel across the country in a black 1967 Chevrolet Impala to hunt demons, supernatural creatures, and other paranormal entities, many of them based on folklore, myths, and American urban legends.
The series also features recurring appearances from other demons, angels, and hunters.
The following characters are angels of God, making them extremely powerful spiritual beings.
Balthazar claims he had saved the Titanic simply because he detested the movie and subsequent eponymous song.
However, upon confrontation with Fate, Atropos reveals she knows Balthazar is working for Castiel; the saving of the Titanic was to provide additional souls to fund their side in the civil war.
In "The Third Man", the Winchesters discover that three corrupt cops were murdered by the young brother of one of their victims in possession of The Staff of Moses.
Balthazar is revealed to have sold it to the boy in return for his soul.He tells Sam that he would need the blood of his father (that needn't come from the "father of your blood"), prompting Sam to try to kill Bobby before he is subdued, Dean and Death managing to recover Sam's soul.Balthazar transports Sam and Dean to an alternate universe, in "The French Mistake", to evade the angelic hit man Virgil and gives them a key which he claims opens where the weapons he stole from Heaven are stored.Merely perceiving their true form - even psychically - typically results in blindness, as the appearance of their natural "visage" is overwhelming; it is capable of burning an individual's eyes from their sockets, although certain "special people" are able to withstand their true appearances and voices.Because their true appearances cannot be safely perceived by humans and because they are spirits with no physical being, they often take on humans as vessels in order to exist in and interact with the physical world, though only with the hosts' consent.Angels require a particular vessel to reach their full potential, people being "chosen" to be their hosts or "true vessels".