Hey, guys, Misha Collins was a series regular on Supernatural in seasons five and six. Series regular does not mean he’s going to be in every episode. It doesn’t even mean he’ll be on more frequently than he has been either.
If we break this down by season, Misha was in 13 episodes in season 4 (non-regular), 13 episodes in season 5 (regular), 12 episodes in season six (regular), 5 episodes season 7 (non-regular), and so far in season eight he’s been in 5 episodes with more appearances promised (non-regular).
Castiel comes around when the story line dictates he should come around. Season 7 he spent a lot of time away because of the story line for that season. He’s not a main character, even as a series regular.
If you think of it like Hawaii Five-0, Masi Oka, who plays Dr. Max Bergman, and Michelle Borth, who plays Lt. Catherine Rollins, are both series regulars. Their names and images are in the opening credits, but we don’t see them every episode.
I just wanted to put this out there because I’m seeing a lot of people getting excited like Misha might be in almost every episode and that’s probably not going to be the case.
I’m sorry to burst any bubbles.