Once Upon a Time season 4, episode 6 airs this Sunday. See the promotional images and read the official synopsis here!

In Once Upon a Time season 4, episode 6, “Family Business,” we flash back to Belle (Emilie de Ravin) meeting Anna (Elizabeth Lail) and going on an adventure – which, from the look of the promo, doesn’t end well.

Related: Once Upon a Time season 4 decoded: What does the scroll say?

Although it’s a Belle flashback, we’ll also see more of Anna’s reunion with Kristoff (Scott Michael Foster) in Arendelle, and one of the promo pics show the Snow Queen (Elizabeth Mitchell) in possession of the wizard hat container.

In the present, Belle is set to discover the truth about Mr. Gold (Robert Carlyle)’s treachery, and will even try using the dagger to control him.

The official synopsis for the episode reads:

“The race is on to track down the elusive Snow Queen, who was once a foster mother to a young Emma – whose memories of this event have been erased – in order to discover what her ultimate end game is for Elsa and the residents of Storybrooke. Unaware that she does not possess the real blade that controls The Dark One, Belle attempts to use it to get her reluctant husband to show her where the Snow Queen is hiding. Meanwhile, back in the past, Belle travels to Arendelle and, with Anna’s help, seeks out Grand Pabbie to help her regain her lost memories.”

Lord of the Rings actor John Rhys-Davies voices Grand Pabbie (the character was voiced by Ciaran Hinds in the original Frozen movie).

Another Frozen character will be introduced this week: Oaken the shopkeeper, who is played by Darcey Johnson.

Check out the full set of Once Upon a Time season 4, episode 6 promotional stills from ABC below:

Once Upon a Time season 4, episode 6, “Family Business” airs Sunday at 8/7c on ABC.