Castiel stepped into the world of the Winchesters during season 4 — in what is easily one of the show’s greatest moments. It was the first time angels were introduced to “Supernatural,” and Misha Collins took it upon himself to make the entrance dramatic. There was a slow, badass walk, sparks were flying everywhere, and Castiel walked gracefully, unbothered by the bullets being pelted at him by his soon-to-be best friend. He was also utterly unbothered by the knife planted into his chest. Castiel exudes strength and mystery … and makes it clear he is to be taken seriously. For casting so fitting, it seems unbelievable that Misha Collins didn’t initially audition for the “Supernatural” character, who was the first angel to have been introduced to the show. Collins auditioned for the part of a demon instead.
In a 2008 interview with MovieWeb, Collins detailed how he came across the role of Castiel. Showrunner Eric Kripke was trying to conceal the season’s inclusion of angels, so he had Collins audition as a demon to keep the news a secret. The actor read the part and interpreted it to be on the malicious, villainous end, so he performed a “nasty and snarky” audition … only to be later told that he would play an angel instead.