before anyone decides to comment negative things about who i ship and what my headcanon is. if you dont like this then dont watch, simple.
after jack and rapunzel build their own kingdom, arendelle, they have a beautiful baby girl named elsa who inherits jack's winter powers, three years later they have another daughter named anna who has the bubbly personality just like her mother.
when elsa is eight years old and anna is five, the two girls decide to have fun and play in the snow elsa created in the ballroom. they get too carried away and elsa accidentally strikes anna on the head with her powers, so she calls for her mother and father. jack and rapunzel come running in and rapunzel heals anna while also tampering with her memories a little, making her forget elsa has winter powers. jack and rapunzel agree to close the gates to keep elsa safe, elsa also decides to distance herself from anna to keep her safe because she's scared that she'll hurt her again.
thirteen years pass and rapunzel decides it's time to hand the thrown over to elsa, so at the coronation party, while rapunzel is dancing, elsa and anna start talking. jack sees this and over the moon that his two little girls are talking and laughing again. but elsa then reminds herself to keep herself distant, so anna has had enough of not understanding this and confronts elsa when she pulls away from her. elsa gets too frustrated and annoyed so she accidentally lets her powers go and runs off in fear. once she gets to the water and starts to freeze it, jack stops in front of her and tells her to stop, but elsa stops believing and runs right through her father. rapunzel sees her daughter run off and begins to get upset. anna decides to go after her sister and tells jack he needs to stay and look after rapunzel.
up in the north mountain, elsa begins to hear this voice telling her she isnt alone and that nothing 'goes better than cold and dark', we then see it is pitch telling her these things, trying to manipulate her and turn on jack.
anna reaches a store where she gets a change of clothes and meets kristoff.
song: say something (instrumental) by a great big world