Series 5
In Series 5 Tornado had a small spinning drum (since the weight limit was increased from 80 kg to 100 kg).
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“As Cuvier could correctly describe a whole animal by the contemplation of a single bone, so the observer who has thoroughly understood one link in a series of incidents should be able to accurately state all the other ones, both before and after.”
—Sir Arthur Conan Doyle (1859–1930)