High Quality Content by WIKIPEDIA articles! Castiel is a fictional character portrayed by Misha Collins on the CW Television Network`s American television series Supernatural. An angel, he first appears in the fourth season, and is used to introduce the theme of Christian mythology to the series. In the series, Castiel brings Dean Winchester back from Hell, and helps Dean and his brother Sam in their battles with various demons and angels. As an angel, he possesses a number of superhuman abilities, including the ability to kill demons with his touch. Initially, the character demonstrates little emotion, though his interactions with Dean have humanized him to a degree.