The Mindless Ones first appeared in Strange Tales # 127, and they are AWESOME. They pretty much just exist to fight and smash and blast everything in sight with their eye beams. Absolutely brilliant.
Obviously added to inject an element of physical peril to the mystical threat of Dormammu, the creatures posed a dire threat to Doctor Strange when he visited the Dark Dimension. They've been little used since, but not for much longer. I can't wait to see what Ellis and Immomen do with them when they them show up in Nextwave: Agents of H.A.T.E. #8.
BEWARE THE MINDLESS ONES!!
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