The highest-rated episodes of fantasy TV shows often feature game-changing events alongside incredible dialogue and visuals. These stellar fantasy series have strong writing overall, with episodes that stand out due to a myriad of factors. A show's best episode may be its first, setting up the story with mystery and potential for future seasons.

The best fantasy TV series of all time claim the best episodes, some of which reach 100% on Rotten Tomatoes. Episodes of fantasy TV like this go above and beyond, demonstrating the high points of the series when a game-changing event takes place with incredible dialogue and visuals in its execution. It is not impossible but rare for the highest-rated episode of a series to be a so-called filler episode. Ratings tend to spike when the episode includes a TV moment fans waited years to see, where all the build-up and foreshadowing finally pays off.

On the other hand,...