Avengers Annual #15

Synopsis

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.