Why did Game of Thrones change actors?

Related questions

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10. Did Game of Thrones change actors?

Tags

1. #ended
2. #transporter
3. #replaced
4. #opportunity
5. #naharis
6. #daario
7. #scenes
8. #because
9. #refused
10. #portray
11. #original
12. #refueled
13. #therefore
14. #character
15. #would
16. #leave
17. #chose
18. #previous
19. #skrein
20. #actor