|Rumpelstiltskin has a dark side|
In the original Grimm fairytale, Rumpelstiltskin is a key figure. A miller lies to the king, telling him that his daughter can spin ordinary straw into gold. The king wants gold, so he imprisons her so that she can make him some. Rumpelstiltskin appears and offers to spin the gold. However, she must offer up to him her first born child.
Cora is the miller’s daughter in ABC's "Once Upon a Time."