<P> The sixth season of the American ABC fantasy - drama Once Upon a Time was ordered on March 3, 2016 . It debuted on September 25, 2016, and concluded on May 14, 2017 . In January 2017, it was stated that the sixth season would end the main storyline, and for a seventh season, the series would be softly rebooted with a new storyline . </P> <P> Existing fictional characters introduced to the series during the season include Aladdin, Princess Jasmine, the Count of Monte Cristo, Captain Nemo, Lady Tremaine, Beowulf, Tiger Lily and the Tin Man . Original new characters include Gideon, the Black Fairy, Mary Lydgate, and Robert . The show also reintroduced Jafar and Dr. Arthur Lydgate, who previously appeared in Once Upon a Time in Wonderland . </P> <P> This season also marks the final appearance of Emma Swan (Jennifer Morrison) as a series regular . Morrison announced she would be departing the series after the sixth - season finale, but if the series receives a seventh season renewal she has agreed to appear in at least one episode . After serving as a series regular for two seasons, Rebecca Mader also announced that season six would be her last on the show . Shortly after, Adam Horowitz and Edward Kitsis announced that original cast members Ginnifer Goodwin, Josh Dallas, and Jared Gilmore, as well as Emilie de Ravin who joined the main cast in season two, would also exit the show at the end of the season . </P> <P> Just when it looks like Storybrooke can enjoy some peace, once more it is threatened by dark forces . The malevolent Mr. Hyde, now separated from Dr. Jekyll, has arrived and brought his fellow inhabitants from the Land of Untold Stories . To make matters worse, Regina's dark half - the Evil Queen - continues to exist despite her heart being crushed; unburdened by a conscience, the Evil Queen has declared war on the heroes and separates Snow and David by placing a sleeping curse on their shared heart . Meanwhile, Aladdin's past as the previous Savior becomes a new factor in Emma's role as the current Savior, and is about to be pushed to the limits, which could lead her to a future that has no happy ending for her, while Gold must deal with trying to win Belle's heart again so they can be a family for their future child . Later on, the Black Fairy abducts Gideon, the son of Gold and Belle, which further complicates things for Storybrooke's residents . As Emma, Regina, and an alternate universe version of Robin Hood return to Storybrooke, Gideon arrives now a grown man, and is revealed to be the one fated to kill Emma . The events lead to the Black Fairy, the creator of the Dark Curse, who is also controlling Gideon with his heart, crossing over into Storybrooke, as the ongoing war between light and darkness ultimately leads to the Final Battle that was prophesied before the casting of the original Dark Curse . After the events of the Final Battle close the last chapter, which finally brought "happy beginnings" for everyone involved, a new one has begun for a grown - up Henry, when his daughter Lucy arrives in Seattle from the New Enchanted Forest, for a new adventure . </P>

Who left once upon a time season 6
find me the text answering this question