Welcome to the weird and wonderful world of the Doctor. If you're new to Doctor Who and are about to tune into the latest specials, here's everything you need to know.

Doctors Everywhere

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A special 75-minute episode, broadcast worldwide on Saturday, will mark the 50th year of 'Doctor Who.'

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David Tennant is officially the Doctor! And has been before. In fact, the actor's connection with the series goes back further than you might think...