Appearing in "Betrayal!"
- Avengers West Coast
- Henry Pym
- Edwin Jarvis (Cameo)
- Quicksilver (Behind the scenes)
- Vault Guardsmen (First appearance)
- National Security Council
- Freedom Force
- Vision (Only in recap)
- Ms. Marvel (Carol Danvers) (Only in recap)
- Beast (Only in recap)
- Daredevil (Only in recap)
- Grey Gargoyle (Only in recap)
Races and Species:
- Humans (Main story and recap)
- Human-Olympian Hybrids
- Mutants (Main story and recap)
- Human-Kree Hybrids (Only in recap)
- Synthezoids (Only in recap)
- Hawkeye's Suit, Bow and Trick Arrows
- Mockingbird's Battle Staves
- Iron Man Armor MK VII
- Wasp's Suit and Wings
- Captain Marvel's Suit
- Captain America's Uniform and Shield
- Ebony Blade
- Guardsman Armor
- Spider-Woman's Suit
- Daredevil's Suit (Only in recap)
- Ms. Marvel's Suit (Only in recap)
Synopsis for "Betrayal!"
A baseball game between the East and West Coast Avengers is interrupted by the team of superhuman government agents called Freedom Force, who arrest the heroes and bring them to the Colorado federal penitentiary known as the Vault to stand trial for treason. The Avengers are helpless in specially prepared cells which negate their powers until a repentant Spider-Woman invades the prison and enables them to escape. Regrouping, they resolve to learn the identity of the former teammate who has betrayed them.
Someone is betraying the Avengers to their deadliest enemy, Agent Gyrich of the U.S. government! Who would dare? What lies has the traitor spread— and why? This is one suspense-filled saga so shocking it's taken two annuals to tell the full tale!
- Higgins credited as managing editor.
- Breakdowns by Ditko and finishes by Janson.
- First appearance of The Vault prison.
- Spider-Woman betrays her Freedom Force teammates and frees the Avengers.
- The events of this issue are concluded in West Coast Avengers Annual Vol 1 1