| Monster Name | First Movie Appearence | First Video Game Appearence |
| Gigan | Godzilla VS Gigan | Godzilla: Monster Of Monsters |
| King Ghidorah | Ghidorah,The Three-Headed Monster | Godzilla: Monster Of Monsters |
| Mechagodzilla | Godzilla VS Mechagodzilla | Godzilla: Monster Of Monsters |
| Megalon | Godzilla VS Megalon | King Of The Monsters,Godzilla |
| Orga | Godzilla 2000 | Godzilla: Destroy All Monsters Melee |
In Godzilla: Unleashed,the Queen of the Vortaak Vorticia,sent out her alien monsters to take over Earth.The alien Mothership was vanguarded by one of the aliens,but is later brought down by an Earth Defender or a GDF Unit.After the Mothership crashes into San Francisco Bay,the Earth monster Varan was awakened.When an alien enters New York,Krystalak is awakened.If an alien frees Baragon from the Power Surge Crystals at Monster Island,he'll battle whoever frees him.Mechagodzilla and the Millennium version of Gigan only appeared in the Nintendo Wii version of Godzilla: Unleashed,while the Showa Gigan appeared in the PlayStation 2 version.