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Mistfall is a climatic event that takes place roughly every fifty years on the planet Alzarius, caused by the gravitational influence of another world pulling it always from its parent star. This results in a period of cold and near-constant mist covering the planet's natural swamps. It is a period most feared by the native Alzarians, as it is during Mistfall that strange and toxic gases are released from the waters, the Marshmen rise from their aquatic lairs and the Riverfruits hatch into newborn Alzarian Spiders.
- Doctor Who season 18 - Full Circle (1980)