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In page Doc Savage:

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A key characteristic of the Doc Savage stories is that the threats, no matter how fantastic, usually have a rational explanation. For example, a giant mountain-walking spider is revealed as a blimp, a scorching death comes from super-charged electric batteries, a "sea angel" is a mechanical construct towed by a submarine, Navy ships sunk by a mysterious force are actually sabotaged, and so on. But Doc Savage also battles invisible killers, a murderous teleporter, and superscientific foes from the center of the Earth.[citation needed]