List of the best Merlin episodes, as determined by voters like you. Merlin is a British fantasy-adventure television series that started airing in 2008. With all the amazing episodes of the show that exist, it's hard to trust just one person's opinion of what the top Merlin episodes of all time are.Fans of Merlin are very passionate about the show, and there are often debates over which episodes are the greatest. That's why this list exists- so you can vote for your favorites and we can find out once and for all what everyone thinks the best episode is. Episodes here include everything from "A Servant of Two Masters" to "The Lady of the Lake." What is the best Merlin episode of all time? Look below and find out.