Best Seasons of Merlin
The Top Ten
1 Season 3
Other than Goblin's Gold, season 3 had some of the best episodes. Also, Gwaine is introduced and Morgana is a great villain
2 Season 4
Uther dies which already makes this season great, and season 4 has some amazing episodes.
3 Season 5
Season five was definitely the best.
4 Season 1
5 Season 2
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