Demo (from Tower)
Demo (from Tower) appears in 1 issue in grailworth's catalog, and was first published in 1965. First appearance: T.H.U.N.D.E.R. Agents #1 (1965), cover dated 1965.
First appearance
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T.H.U.N.D.E.R. Agents (1965) 1 issue
Character appearances from the Grand Comics Database, CC BY-SA 4.0.