Board Thread:Spoilers!/@comment-32390199-20150823222638/@comment-4636650-20150902183713

Hmcooper4 wrote: I honestly don't think that you could properly pull off an Arthurian storyline without a few basic elements

 Love triangle between Arthur, Guin, and Lance Excalibur and the Lady in the Lake The Round Table The Quest for the Holy Grail (Or at least the knights involved in said quest) Morgan Le Fay and Mordred They have already addressed the Love Triangle, the Round Table, and at least the main characters for the Holy Grail (and I suspect there will be some variation of the Grail itself). Excalibur has already been hinted at in Season 3, so I feel confident they will address that as well.

That just leaves Morgan and Mordred. There is just way too much potential there to NOT have some part of the story include these individuals. My guess is that they will show up, and that may be where the writers introduce one of the twists to the story. Tbh I think that the basic elements needed for a successful version of an Arthurian storyline seem to vary depending on the intentions of the writers; I've seen versions that are done fairly well that only have one or two of the elements you've listed. I agree that the love triangle is a neccessity as is Excalibur, Morgan and Mordred are also very important but you can get away with only having one of them and it still working, the Round Table and the Lady of the Lake are interesting but not usually vital and tbh the Quest for the Holy Grail is dispensible, I've only seen maybe one or two versions that even mention the Grail. Though I agree that Morgan and Mordred have too much potential for OUAT to not introduce them :)