| Any playable character |
Defeat "Monster Island, The Final Battle" level with that character |
| Atorgon |
Defeat "Atlantis Rises From The Deep" level |
| Baragon |
Defeat "Hedorah Terrorizes San Francisco" level |
| Biollante |
Defeat "Biollante Attacks Paris" level |
| Destoroyah (NPC) |
Defeat "Monster Island, The Final Battle" level |
| Ebirah |
Defeat "Ebirah Swamps Tokyo" level |
| Hedorah |
Defeat "Hedorah Terrorizes San Francisco" level |
| Jet Jaguar |
Defeat "Orga Thrashes Sydney" level |
| Manda |
Defeat "Atlantis Rises From The Deep" level |
| Mecha King Ghidorah |
Defeat "Mecha King Ghidorah Ravages Bangkok" level |
| Mechagodzilla |
Defeat "Cairo Is...Lost In Space" level |
| Megaguirus |
Defeat "Biollante Attacks Paris" level |
| Moguera |
Defeat "Mecha King Ghidorah Ravages Bangkok" level |
| Orga |
Defeat "Orga Thrashes Sydney" level |
| SpaceGodzilla |
Defeat "Monster Island, The Final Battle" level |
| The Sphinx |
Defeat "Cairo Is...Lost In Space" level |
| Titanosaurus |
Defeat "Ebirah Swamps Tokyo" level |
