John R Walker was voted "Britain's Most Prolific TV Extra in 2013 , he has been a TV extra for 15 years and a Doctor Who fan for as far back as he can remember.
Here he talks about his experiences on the set of Doctor Who, Torchwood and The Sarah Jane Adventures.
With stories re written and updated from his other book "Extra Time", this is his definitive memoir of his time in the Doctor Who universe.
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