Castiel /ˌkæstiˈɛl/ (nicknamed "Cass") is a fictional character portrayed by Misha Collins on The CW's American fantasy television series Supernatural. An Angel of the Lord, he first appears in the fourth season and is used to introduce the theme of Christian theology to the series. In the series, Castiel brings Dean Winchester back from Hell and frequently helps him and his brother, Sam, in their battles with various demons and angels along the way. During his travels with the Winchesters, Castiel develops friendships with both men. As an angel, he possesses a number of supernatural abilities, including the ability to kill demons. Initially, the character demonstrates complete devotion to God and little emotion. However, his interactions and experiences with Dean and Sam, as well as certa