ToescapetheclutchesoftheevilwarriorandsorceressMorgana,MerlintransportsyoungKingArthurintomoderndayAmerica.WhenMerlincomesbacktenyearslatertoretrievehim,hefindsahip15year-oldArthurwhodoesnotbelieveMerlin,nordoeshewanttoreturntothepast.MerlinmustconvinceArthurofhistrueidentity,beforeMorganacanretrieveExcaliburandallowtheDarkForcestotakeovertheworld.