Grey's Anatomy star Sandrah Oh, who plays Dr. Cristina Yang in the series, dresses up as a fairy in new Sesame trailer for Elmo's Letter Quest & Other Magical Tales now available in DVDs in Sesame Store.

As a fairy, Sandra teaches Cookie Monster that it's important to eat other things, too, aside from cookies by giving the puppet the "cookie touch" that transforms everything he touches to cookies.

In the espisode, Sir Elmo, Sir Abby, and Sir Telly discover a Yogurt-Eating Yodeling Yak as the knights go in quest to find things that start with the letter Y. Their adventures continue when the Shoe Fairy played by Emmy-winning actor Neil Patrick Harris appears and shows Abby and Telly that there are shoes for everyone and everything.

To purchase the Elmos Letter Quest & Other Magical Tales in DVDs, visit the Sesame Street Store here.

Watch the Sesame Street video for Elmos Letter Quest & Other Magical Tales below: