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In this BBC science fiction series - a spinoff of the long-running Doctor Who - Sarah Jane Smith (Elisabeth Sladen), a companion of the third and fourth incarnations of Doctor Who (from the original series, not the 2005 revival) sets off on a series of fantastic missions that include saving the world from evil alien takeovers, and helping lost extraterrestrials find their way home from time to time. She is aided in her missions by a team of young assistants including Luke Smith (Tommy Knight) and Maria Jackson (Yasmin Paige of Ballet Shoes).