Spider-Man and His Amazing Friends: Season 1, Episode 8
The Prison Plot (31 Oct. 1981)
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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.
Writer:Donald F. Glut