A new 30-second promo for the upcoming fifth season of ABC's "Once Upon a Time" features glimpses of what came before and teases of what's to come: namely Merida from "Brave" and King Arthur and the Knights of the Round Table.

Seen as part of TVLine's Fall TV Preview, the promo showcases plotlines from the previous seasons, reminding viewers of the introduction of Oz and Emma's Dark turn following her sacrifice during the previous season's finale. The promo also gives fans a look at Scottish archer Merida in action and the legendary moment of King Arthur pulling out the sword in the stone.

"Once Upon a Time" returns September 27.