Doctor Doom built these tennis ball-sized items as a defense system, launching them in swarms through small passages or rooms. Attracted to heat (such as the one in a human's body), the spheres flew to the victims to cover them completely, then they exploded to travel, along with their prisoners, to another, unscapable dimension. He used them on the Fantastic Four once, but they tricked the spheres with flame images generated by the Human Torch.[1]

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