Ep 4. The Apprentice

Emma and Elsa team up to figure out who trapped Elsa inside the urn. As they search, they encounter a new problem; the Snow Queen. Regina's quest to find the author of the storybook takes her to a shocking discovery. Meanwhile, in flashbacks, we see a young apprentice named Anna who is taken under the wing of the Sorcerer and learns to take responsibility for her powers.

The fourth episode of Once Upon a Time's fourth season, titled "The Apprentice," is an exciting one. With the addition of Frozen's Anna and Elsa to the show's cast, the writers have opened up new avenues to explore, and this episode does just that.

The episode begins with a flashback to Arendelle, where Anna is searching for answers about her parents' past. She stumbles upon the Sorcerer's tower and is taken under his wing as his apprentice. We see her training with him and learning to take responsibility for her powers. It's a fun and informative flashback that sheds light on Anna's backstory.

In the present day, Emma and Elsa are trying to figure out who trapped Elsa inside the urn. They team up and work together to try and track down the person responsible. However, their search is interrupted by the appearance of the Snow Queen. She seems to have a connection to Elsa and knows more about her past than anyone else. She is a mysterious and intriguing new character, and her interactions with Emma and Elsa are some of the strongest parts of the episode.

Meanwhile, Regina is on her own quest to find the author of the storybook. She believes that by finding him, she can change her own fate and the fate of those around her. Her quest takes her to a surprising discovery that will have long-lasting implications for the show's narrative.

One of the standout moments of the episode comes when the Sorcerer's Apprentice, who has been absent since the end of the third season, makes a return. He holds crucial information that may help Elsa and Emma in their search, and his scenes with Emma are some of the most emotional of the episode.

Overall, "The Apprentice" is another strong episode of Once Upon a Time. It balances the different storylines with ease and introduces intriguing new characters that viewers will want to know more about. The flashback to Anna's training adds depth to her character, and the hunt for the author of the storybook sets up a new direction for the show's narrative.