| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| what season does castiel show up | 0.12 | 0.5 | 6569 | 28 |
| what season and episode does castiel show up | 0.21 | 0.9 | 3187 | 76 |
| what episode does castiel show up | 1.25 | 0.6 | 4742 | 76 |
| what season did castiel come in | 1.06 | 0.9 | 2481 | 71 |
| what season is castiel introduced | 1.28 | 0.1 | 7022 | 51 |
| what episodes are castiel in | 1.44 | 0.5 | 994 | 61 |
| what episode is castiel introduced | 1.01 | 0.2 | 1734 | 88 |
| what season does castiel die | 1.88 | 0.2 | 9348 | 75 |
| when does castiel show up in supernatural | 0.16 | 0.8 | 2083 | 48 |
| when does castiel come back | 0.85 | 1 | 7643 | 60 |
| supernatural what season does castiel appear | 1.33 | 0.8 | 1851 | 78 |
| when does castiel first appear | 1.98 | 0.3 | 3467 | 69 |
| what happens to castiel in season 15 | 0.55 | 0.6 | 196 | 93 |
| what season in supernatural does castiel come | 0.44 | 0.3 | 6338 | 60 |
| what season does castiel enter supernatural | 0.36 | 0.5 | 9371 | 32 |
| first episode castiel appears in | 1.43 | 0.9 | 8677 | 96 |
| when does castiel appear in supernatural | 0.72 | 0.7 | 6509 | 88 |
| when do we meet castiel in supernatural | 1.7 | 1 | 3076 | 41 |
