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* in Doctor Who's first series after its revival, episodes 4-5 and 11 featured the alien Slitheen family of the planet Raxicoricofallapatorius, which were said to be Calcium-based life forms, causing them to be blown up in contact with vinegar.

The Slitheen family also reappeared in several episodes in The Sarah Jane Adventures series, as well as cameo appearances in later Doctor who Episodes.