The Third Doctor +

The Third Doctor was played by Jon Pertwee. While grounded on Earth, he served as the Scientific Adviser to UNIT. In this position, he worked with Brigadier Lethbridge-Stewart, Liz Shaw, Jo Grant, Sergeant Benton, and Captain Yates. Once his freedom was restored, he eventually met and traveled with Sarah Jane Smith.

Read more about this topic on the Tardis Data Core.
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