Trolltider – the legend of the Bergatrollet is SVT's Christmas calendar 2023, directed by Lisa Farzaneh from a script by Ola Norén and Roland Ulvselius. The series is a "reboot" to SVT's Christmas calendar Trolltider from 1979 with partly the same characters but a new story.
Nelly and the dog London are joined by Valle as they head out into the Black Forest to find the Mirror of Death. A journey that takes them deeper and deeper into the forest and to the place where Nelly's mother once disappeared.
Nelly and her dog London are about to spend autumn break with her uncle Hannibal. Soon she noticed that he doesn't live a quiet life. Her uncle is a Monster agent. Nelly gets dragged in to an adventure filled with ghosts, vampires and werewolves.
Matilda Gross, born 2009, is a Swedish child actor. Gross has played the lead role of Matilda in Matilda the Musical at Malmö Opera. She has also appeared in Sound of Music at Nöjesteatern in 2017 and at Malmö Opera in 2021. Gross has also played the lead role as Nelly in the films Nelly Rapp – Monster Agent from 2020 and Nelly Rapp – Mirror of Death 2023. In March 2023 it was announced that she will play one of the main roles in Trolltider – the legend of the mountain troll which is the 2023 Christmas calendar on SVT where she plays Saga. In 2025, Gross will appear in the third film adaptation of the cartoon character Bert. She will play the role of the love interest Molly in this film.