"We don't do angels on this show," Supernatural creator Eric Kripke recalls saying back in Season 3. Fast-forward two seasons and he now admits, "Looking back it was obvious."

Supernatural's Misha Collins wants to catch people off-guard with random acts of kindness

In this exclusive, behind-the-scenes clip from the Season 5 DVD, Kripke talks about the introduction of Misha Collins' character Castiel. Plus: He and writer Bob Singer discuss their original five-year plan for the show and how they chose to dramatize the apocalypse in Season 5.