Do You Want To Fly The TARDIS?

AU towards the end of 'The Angels Take Manhattan'. The Eleventh Doctor, finding himself once more traveling alone, ends up in Arendelle on the night of Queen Elsa's coronation. Seeing the eternal winter that has come upon the lands, he decides to help, teaming up with Princess Anna, Kristoff, Sven and Olaf to bring back summer and discover the truth about Elsa's powers.