In the strictest sense, an alien is any being or animal that is foreign to your own homeworld, either from another planet, or dimension.
Known Alien Races in the SuperFriends Universe:
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- Sand Monsters
- Santars
- Sargasso troops
- Saturnian
- Satyr
- Sauroids
- Sector 13 aliens
- Sirena's Species
- Sklarian
- Slyggian
- Solar Terrarium humanoid
- Space Dolls
- Space elephant
- Space turtle
- Spacemen
- Spacemen of Theta Blue
- Spider Guild
- SSlithiss
- Star Conqueror
- Star Master's Species
- Starhavenite
- Sun Creatures
- Suvian