What season is Castiel in most of Supernatural?

Answer 1

Season 4-

4.01 - Lazarus Rising

4.02 - Are you there, God? It's me, Dean Winchester.

4.03 - In the Beginning

4.07 - It's the Great Pumpkin, Sam Winchester

4.09 - I know what you did last summer

4.10 - Heaven and Hell

4.15 - Death takes a Holiday

4.16 - On the head of a pin

4.18 - The monster at the end of this book

4.20 - The Rapture

4.21 - When the Levee Breaks

4.22 - Lucifer Rising

Season 5 -

5.01 - Sympathy for the Devil

5.02 - Good God, Ya'll!

5.03 - Free to be you and me

5.04 - The End

5.06 - I believe the children are our future

5.08 - Changing Channels

5.10 - Abandon all hope...

5.13 - The song remains the same

5.14 - My Bloody Valentine

5.16 - Dark Side of the Moon

5.17 - 99 Problems

5.18 - Point of no Return

5.21 - Two Minutes to Midnight

5.22 - Swan Song

Season 6 -

6.03 - The Third Man

6.06 - You Can't Handle the Truth

6.07 - Family Matters

6.10 - Caged Heat

6.12 - Like a Virgin

6.15 - The French Mistake

6.17 - My Heart Will Go On

6.18 - Frontierland

6.19 - Mommy Dearest

6.20 - The Man who would be King

6.21 - Let it Bleed

6.22 - The Man who knew too much

Season 7 -

7.01 - Meet the new boss

7.02 - Hello, Cruel World

7.17 - The Born Again Identity

7.21 - Reading is Fundamental

7.23 - Survival of the Fittest

That should be all of them, hope this helps! :)

Answer 2

Castiel appears in Season 4. BUT DON'T SKIP TO HIM. There is a lot of stuff you won't understand if you skip to him.

Answer 3

Season 10. He was in 15 episodes, versus many other 13 episoders and 14 episoders. ;)

Answer 4

Castiel first appears in Season 4, Episode 1, Lazarus Rising.