When did Russell Davies leave Doctor Who?

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Tags

1. #steven
2. #departure
3. #moffat
4. #announced
5. #doctor
6. #specials
7. #ended
8. #after
9. #publicly
10. #davies
11. #january
12. #executive
13. #succeeded
14. #series
15. #fourth
16. #airing
17. #producer
18. #writer