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Help Arthur and Nimueh in 'Quest for the Mortaeus' or save the kingdom in 'Camelot Defence'.
Use Merlin's magic spells to defend Camelot from Nimueh's mythical beasts.
Help Arthur defeat Nimueh and find the cure to save Merlin.
Meet the heroes of Camelot.
Find out more about the Merlin villains.
Watch exclusive extra clips and character profile videos.
View exclusive episode images.