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In page Doctor Who:

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The Sarah Jane Adventures, starring Elisabeth Sladen who reprised her role as investigative journalist Sarah Jane Smith, was developed by CBBC; a special aired on New Year's Day 2007, and a full series began on 24 September 2007.[6] A second series followed in 2008, notable for (as noted above) featuring the return of Brigadier Lethbridge-Stewart. A third in 2009 featured a crossover appearance from the main show by David Tennant as the Tenth Doctor. In 2010, a further such appearance featured Matt Smith as the Eleventh Doctor alongside former companion actress Katy Manning reprising her role as Jo Grant. A final, three-story fifth series was transmitted in autumn 2011 – uncompleted due to Sladen's death in early 2011.[citation needed]