Aliens that appeared in other media or series that are separated of the main continuities of the franchise.
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All items (109)
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- Samson
- Sandbox (Thomas Perkins)
- Scooter Alien
- Scorn
- Sektoid Transformation
- Shadowman
- Shafarnian
- Shellhead (Thomas Perkins)
- Shock Blast
- Skateasaurus
- Skele-TON
- Skidmarx
- Slezak
- Snakepit (Thomas Perkins)
- Snark Tanque
- Somnambulizard
- Soulcatcher
- Squidstrictor
- Squirtapiller
- Steeler
- Stretcheleo
- Swampfire (MAD)
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