Why was the Mountain recast?

Related questions

1. How did the Targaryen dragons die?
2. Who killed Rhaenys?
3. Who is Qyburn in Game of Thrones?
4. Did they use a real bear in Game of Thrones?
5. Who is the god of dragons?
6. How did the targaryens get dragon blood?
7. Is Blue Eyes White Dragon a normal monster?
8. Where did the legend of dragons come from?
9. Who killed mormont?
10. What happened to Sir Gregor's face?

Tags

1. #originally
2. #season
3. #little
4. #trilogy
5. #amount
6. #answer
7. #entailed
8. #stevens
9. #filming
10. #replaced
11. #whyte
12. #hobbit
13. #conan
14. #screen