The kids are on a South American expedition with Velma's uncle, Professor Cosmo Dinkly, to recover the Celestial Orb" a baseball sized ruby, that has a map on the Lost Temple of Syrius. The temple is believed to have been built by the ancient astronauts and filled with secrets and treaure. It soon seems that they are not the only ones searching, Professor Dinkley's ex-assistant Ms. Mullens is lurking in the backroom, waiting to steal the orb.
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