“Betrayal!”
The Avengers versus Ultron-6.
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Avengers #66 (1963) is issue #66 of Marvel's Avengers (1963–1996), with a cover date of July 1969. Written by Roy Thomas and drawn by Barry Windsor-Smith. It has the first appearance of Myron MacLain.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.