Appearing in "Betrayal!"
- Myron MacLain (First appearance)
- Odin All-Father (Invoked)
- U.S. Army (Mentioned)
- The President (Mentioned)
- S.H.I.E.L.D. Agents
- Robin Hood (Mentioned)
- Wonder Man (Simon Williams) (Mentioned) (Deceased)
Races and Species:
- Adamantium (First appearance)
- Yellowjacket's Suit
- Iron Man Armor Model 3
- Goliath's Suit
- Wasp's Suit
- Avengers Identicard (Mentioned)
- Molecular Rearranger (First appearance)
- Trick Arrows (Mentioned)
- Adamantium (On Ultron's body)
Synopsis for "Betrayal!"
The Avengers (joined by their long-absent members Iron Man and Thor) are invited to attempt to destroy a cylinder of Adamantium created by scientist Myron MacLain aboard S.H.I.E.L.D.'s helicarrier. While discussing the potential use of the metal, the Vision soon finds his mind being taken over and he disappears.
Shortly afterward, as the Avengers return home, Iron Man is suddenly trapped in the training room, and while the other Avengers are occupied getting him out, the Vision travels to the helicarrier and steals the cylinder of Adamantium.
When the Avengers find out they begin to speculate why Vision would betray them, just as the Vision returns and attacks the Wasp. The Avengers gang up and attack the Vision, until the Vision tells them that, for reasons beyond his control, he'd used the Adamantium to rebuild his creator: Ultron.
The one you've been waiting for! THOR and IRON MAN return to the ranks! But, can even they prevail when the vengeful VISION goes wild? Plus a cataclysmic surprise ending!
- Comic Book Artist #2, pg. 21 presents the previously unpublished Barry Windsor-Smith rejected cover for this issue.
- This issue features the first appearance of the fictional metal alloy Adamantium.