David tennant makes a return glad to see a familiar face again, but this trailers has continuity errors all over it with 3 doctors all being in the same place/room as one and other. I thought that was impossible as we found out with rose when she tried saving her dad.
English
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The entire thing about the storyline with her dad was that the time lords used to prevent the reapers appearing. you could casually change time.
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This isn't the first time there have been multiple Doctors together. It happened several times in the old series. The rules are probably different for timelords.