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The Cassiopeian Dream Eater is an alien-based organism that Albedo attempted to infect Ben with in order to get his Ultimatrix in Night of the Living Nightmare, but ends up accidentally infecting himself and trapping himself in a nightmare.
The Dream Eater feeds off the chemicals produced by the brain during stress and thus once it attaches to a host, it traps the host into a nightmare to feed off these chemicals. It is possible to manually remove it, but its host's face will be taken along with it.