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The Dreg were in Titan A.E. With Drew Barrymore and the guy from Borne Identity and Dogma.
I don't know if there were wraiths in there.
dreg
Drag, dreg, drug...
red, age, gag, rag, rage, dreg, drag, grade, ragged, ear, ummm...
deer, red, seed, reed, edge, dreg