Where can I watch Avengers Grimm in United States?

When Rumpelstiltskin destroys the Magic Mirror and escapes to the modern world, the four princesses of "Once Upon a Time"-Cinderella, Sleeping Beauty, Snow White, and Rapunzel-are sucked through the portal too. Well-trained and endowed with magical powers, the four women must fight Rumpelstiltskin and his army of thralls before he enslaves everyone on Earth.