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Professor Tansbury was a scientist who conducted experiments in a disused lighthouse off the coast of Porthferiot, Cornwall. He harnessed the power of a lightning storm to accelerate the growth of a lizard, but the circuits overloaded and the lizard grew to giant size, destroying the lighthouse and killing Tansbury. This was witnessed from shore by a local fisherman, and few days later the Fourth Doctor and Sarah Jane Smith visited Porthferiot to investigate. (TVC: The Tansbury Experiment)