04 Aug, 2013, Tyche wrote in the 1st comment:
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Peter Capaldi, who played a WHO doctor in World War Z, now playing a doctor WHO.
04 Aug, 2013, Zeno wrote in the 2nd comment:
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Haha yeah I saw that.

Also John Frobisher in Torchwood and Caecilius in previous episode of Doctor Who.

Also online betting lol, 11 hours ago: http://www.theage.com.au/entertainment/b...
04 Aug, 2013, Lyanic wrote in the 3rd comment:
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I thought it was odd that the new Doctor previously played a non-Doctor character in an episode of Doctor Who.
04 Aug, 2013, quixadhal wrote in the 4th comment:
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Not unprecidented Lyanic, Colin Baker (6th Doctor) played a guard on Gallifrey during Tom Baker's era.