The film follows the journey of Kitty, the imaginary friend to whom Anne Frank dedicated her diary. A fiery teenager, Kitty wakes up in the near future in Anne Frank's house in Amsterdam and embarks on a journey to find Anne, who she believes is still alive, in today's Europe. While the young girl is shocked by the modern world, she also comes across Anne's legacy.

To free Baba Yaga and Renfield from the clutches of Monster Hunter Mila Starr, the Wishbone Family once more transforms into a Vampire, Frankenstein's Monster, a Mummy and a Werewolf. Aided and abetted by their three pet bats, our Monster Family zooms around the world again to save their friends, make new monstrous acquaintances and finally come to the realization that ‘Nobody’s Perfect’ – even those with flaws can find happiness.

Inspired by the classic tale of Peter Pan, The Lost Girls chronicles four generations of Darling women as they struggle in the aftermath of their adventures with Peter Pan in Neverland. Like her grandmother and her mother Jane before her, Wendy must escape Pan’s hold on her and the promise he desperately wants her to keep. As her daughter Berry comes into Peter’s orbit, Wendy must fight to save her relationship with her daughter while reconciling her legacy.