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.
Unlike a stereotypical portrayal of television angels, Castiel does not help people, and is willing to kill innocents if needed. Collins originally read for the part of a demon, as series creator Eric Kripke did not want fans to find out that angels were being introduced to the series. Collins prepared for the role by reading the Book of Revelation, and based his portrayal on his younger brother. Critics and fans have responded favorably to the character. In response, the show's creators expanded his role in the series and have upgraded him to a star beside Jared Padalecki and Jensen Ackles in the fifth season.
At the end of the third season of Supernatural, main character Dean Winchester is in Hell after being killed by the hellhounds of the demonic antagonist Lilith. In the season four premiere "Lazarus Rising", the angel Castiel is introduced. He has brought Dean back from Hell, resurrecting him. Because merely perceiving his actual form typically results in blindness, Lilith is breaking the 66 seals in order to free Lucifer, and Dean must stop her.
Castiel continues to appear throughout the season, at one point sending Dean back in time and later tasking him and his brother Sam with stopping witches from breaking another seal. In the following episode, "Heaven and Hell", Anna uses a mystical Enochian sigil to send the angels away, though they manage to track them down later. Once there, Castiel expresses regret at having to kill Anna. Before they can carry out their duty, however, they are confronted by the demon Alastair and two of his minions. A fight ensues, and Castiel is nearly defeated in the battle by Alastair. He is saved by Dean, and they in turn are rescued when Anna regains her powers. Although Uriel nearly vents his frustration on Dean, Castiel stops him, and the two leave. Castiel later becomes suspicious of Uriel and confronts him in "On the Head of a Pin". Uriel admits he and certain other angels are now working together to free Lucifer, having grown weary of never hearing from God and jealous of His favoritism for humanity. He asks Castiel to join him, but Castiel refuses and attacks him. Uriel eventually overpowers Castiel, but is killed by Anna before he can strike the finishing blow.
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Official Site: CW TV
Links: Wikipedia-Castiel Castiel Wiki Angel of the Lord - Supernatural