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.
| Actor | Role |
|---|---|
 Emily CareyAnne Frank (voice) | Anne Frank (voice) |
 Ruby StokesKitty (voice) | Kitty (voice) |
 Sebastian CroftAnne's Peter (voice) | Anne's Peter (voice) |
| RRalph ProsserKitty's Peter (voice) | Kitty's Peter (voice) |
 Michael MaloneyOtto Frank (voice) | Otto Frank (voice) |
 Samantha SpiroEdith Frank (voice) | Edith Frank (voice) |
 Skye BennettMargot Frank (voice) | Margot Frank (voice) |
 Tracy-Ann ObermanAuguste Van Daan (voice) | Auguste Van Daan (voice) |
 Stuart MilliganHerman Van Daan (voice) | Herman Van Daan (voice) |
 Andrew WoodallAlbert Dussel (voice) | Albert Dussel (voice) |
| NNaomi MourtonAwa (voice) | Awa (voice) |
 Ari FolmanOfficer Van Yaris (voice) | Officer Van Yaris (voice) |
 Nell BarlowOfficer Elsa Platt (voice) | Officer Elsa Platt (voice) |
| MMaya MyersSandra (voice) | Sandra (voice) |