The Mystery Files of Shelby Woo (1996)
S2E7 The Case of the Knockout Gas
Episode Overview
Convenience stores in the "Reddy Eddy" chain are mysteriously being infiltrated with a gas that renders the employees unconscious for a short time. When they regain consciousness, they find that no items have been taken! Is this an act of vengeance or merely a prank? Complicating matters for Shelby is her burgeoning crush on the son of one of the primary suspects in the case.
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S2