Spider-Man and His Amazing Friends
The Prison Plot
S01E08 - Airdate: 1981-10-31
Runtime: 25 min
The evil Magneto places a force field around a prison island, holding the prison staff and others attending a convention (including the Spider-Friends) hostage. Magneto seizes control of the power supply to the entire East Coast and threatens to destroy the Earth unless his "Brotherhood Of Evil Mutants" are immediately paroled from jail.
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Episode details and rating from TVmaze.