 This article belongs to the Classic Continuity.
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The Nightmarish Alien was one of the alien prisoners on Incarcecon in Ben 10: Secret of the Omnitrix.
Appearance
He is a stocky alien with tentacles for arms, four legs, and a large mouth. He has six pink eyes. His body is colored purple and light blue. He has three grey toes on each leg.
History
He was seen when Tetrax was explaining how there are no rules on Incarcecon. He was later seen when Gwen was exposed to everyone when Ben turned into Perk Upchuck. In Omniverse, he is a member of Psyphon's Gang.
Appearances
Ben 10
- Ben 10: Secret of the Omnitrix (first appearance)
Ben 10: Omniverse
- Special Delivery (first re-appearance; cameo)
- Mud Is Thicker Than Water
- Clyde Five (cameo)
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