Earth is visited by a race of aliens, who issue an ultimatum: either peace or complete destruction.
| Actor | Role |
|---|---|
 Maureen StapletonMother Earth (voice) | Mother Earth (voice) |
 Jack WardenRocko (voice) | Rocko (voice) |
 Dizzy GillespieThe Musicians | The Musicians |
| SSam HubleyThe Musicians | The Musicians |
| LLinda AtkinsonThe Musicians | The Musicians |