See the Once Upon a Time stills from Sunday’s episode “Welcome to Storybrooke,” featuring Jamie Dornan as Sheriff Graham!

This episode of Once Upon a Time features our first flashback to Storybrooke, showing what happened when Regina first transported all of the fairytale characters to the real world.

Check out these promotional stills released by ABC that show Regina and Sheriff Graham dealing with what looks like a pair of unexpected visitors:

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You can also see a second promo released for the episode:

The official episode description for “Welcome to Storybrooke” reads:

Emma, David and Mr. Gold must protect Mary Margaret against Regina, who is out for revenge and has made it her mission to kill Mary; and Henry, fed up with all of the feuding, devises a plan to put an end to magic. Meanwhile, Regina discovers that a father and son have somehow found their way into her allegedly undetectable town as she and the fairytale characters deal with the effects of the newly cast curse 28 years prior, on “Once Upon a Time.”

Once Upon a Time 2×17 “Welcome to Storybrooke” airs Sunday at 8/7c on ABC.

Don’t forget to check out Hypable’s Once Upon a Time podcast Onceable, where the hosts discuss each episode of the show as they air!