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The girls receive a call from some miners of marshmallows that a snowball-throwing monster has been “terrorizing” them. The girls eventually find out that the “snow” is really ash, and the “monster” is actually a geologist warning them that an active volcano is not a safe place to work.

Watch the full The Adventures of Mary-Kate & Ashley: The Case of the Volcano Mystery movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.