In the first season of , there are several episodes in which the brothers have to fight ghosts. In these early years, ghosts were far more of a task than they became later on, with Sam and Dean having to fight harder to overcome the apparition.
Ghosts were far less common after Sam and Dean had to start battling gods, demons, angels, and even the Devil and God.
There were many that were either serious threats to the brothers or surprising allies.
Before demon-killing knives and bullets, and Sam and Dean took on dozens of demons at once with little issue, demons were a more fearsome conflict. The brothers used the word "Cristo" to make a demon show its true form, and they had to perform an exorcism to send demons back to Hell.
At the beginning of this story, Sam has no interest in the family business and wanted to live a normal life after going to college. However, as time went on he showed less of an interest in pursuing a "normal" human life.
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