Ladder

A ladder is a vertical or inclined set of rungs or steps.

Physical appearance
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Season one
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Season two
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Appearances

 * Scooby-Doo, Where Are You!
 * 101. What a Night for a Knight
 * 111. A Gaggle of Galloping Ghosts
 * What's New, Scooby-Doo?
 * 213. New Mexico, Old Monster