Season 4
Artwork
| # | Image | Title | Aired |
|---|---|---|---|
| 1 |  | Return to Thundera! (1) | Sep 4, 1989 |
| 2 |  | Return to Thundera! (2) | Sep 5, 1989 |
| 3 |  | Return to Thundera! (3) | Sep 6, 1989 |
| 4 |  | Return to Thundera! (4) | Sep 7, 1989 |
| 5 |  | Return to Thundera! (5) | Sep 8, 1989 |
| 6 |  | Leah | Sep 11, 1989 |
| 7 |  | Frogman | Sep 12, 1989 |
| 8 |  | The Heritage | Sep 13, 1989 |
| 9 |  | Screwloose | Sep 14, 1989 |
| 10 |  | Malcar | Sep 15, 1989 |
| 11 |  | Helpless Laughter | Sep 18, 1989 |
| 12 |  | Cracker's Revenge | Sep 19, 1989 |
| 13 |  | The Mossland Monster | Sep 20, 1989 |
| 14 |  | Ma-Mutt's Confusion | Sep 21, 1989 |
| 15 |  | Shadowmaster | Sep 22, 1989 |
| 16 |  | Swan Song | Sep 25, 1989 |
| 17 |  | Touch of Amortus | Sep 26, 1989 |
| 18 |  | The Zaxx Factor | Sep 27, 1989 |
| 19 |  | Well of Doubt | Sep 28, 1989 |
| 20 |  | The Book of Omens | Sep 29, 1989 |