This Doctor was a happy, childish Doctor. When he is trying to be serious, no one takes him for granted. He regenerated because the Master zapped him with a laser. He then got revenge by zapping the Master on his body with lightning and then teleported back to the Cybermen space ship.

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He appeared in the finale episode of series two, "The Mind Wipe", and the rest of series 3 and 4.1

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