Season four began airing on September 4, 1989 and concluded after 20 episodes on September 29, 1989.
Broadcasted Episodes[]
| Number | Title | Original Airdate |
| 4.01 | Return to Thundera - Part I | September 4, 1989 |
| 4.02 | Return to Thundera - Part II | September 5, 1989 |
| 4.03 | Return to Thundera - Part III | September 6, 1989 |
| 4.04 | Return to Thundera - Part IV | September 7, 1989 |
| 4.05 | Return to Thundera - Part V | September 8, 1989 |
| 4.06 | Leah | September 11, 1989 |
| 4.07 | Frogman | September 12, 1989 |
| 4.08 | The Heritage | September 13, 1989 |
| 4.09 | Screwloose | September 14, 1989 |
| 4.10 | Malcar | September 15, 1989 |
| 4.11 | Helpless Laughter | September 18, 1989 |
| 4.12 | Cracker's Revenge | September 19, 1989 |
| 4.13 | The Mossland Monster | September 20, 1989 |
| 4.14 | Ma-Mutt's Confusion | September 21, 1989 |
| 4.15 | The Shadowmaster | September 22, 1989 |
| 4.16 | Swan Song | September 25, 1989 |
| 4.17 | Touch of Amortus | September 26, 1989 |
| 4.18 | The Zaxx Factor | September 27, 1989 |
| 4.19 | Well of Doubt | September 28, 1989 |
| 4.20 | The Book of Omens | September 29, 1989 |