Queen Guinevere

Guinevere, is a character on ABC' s Once Upon a Time. She debuts, with her first appearance, in the second episode of the fifth season. She is portrayed by guest star Joana Metrass.

Before the Third Curse
When Emma, her allies and Zelena arrive in Camelot, King Arthur introduces his wife Guinevere to the, wjo welcomes them to the castle. They hold a ball in honor of the arrival of The Savior (who Regina claims to be), as it was prophesied that they will be the one to free Merlin from the tree. At the ball Guinevere, along with everyone else witnesses Sir Percival killed by David after he tries to kill Regina. After the aftermath Guinever tells Arthur that the new guests frighten her and is scared as to what other troubles they will bring. but Arthur tells her that they are the only hope of freeing Merlin and finding the missing piece of Excalibur.

During the Third Curse
After Emma curses everyone back to Storybrooke, Guinevere arrives with no recollection of how she arrived. She is reunited with Arthur, but shocked to find that Excalibur has gone missing. David informs them that if it's in Storybrooke, they'll find it.