provides the voice for Pling , one of the magical pangolin creatures the siblings meet in the underworld.

The movie follows , a 12-year-old boy struggling with anxiety, and his fiercely energetic 9-year-old sister, Verity . When their family relocates to their grandfather's sprawling old mansion, the siblings discover that reality is far more fluid than it seems.

as Verity Drawmer , Peter’s bold and protective younger sister. Browne is known for her appearances in high-profile projects like Nine Perfect Strangers and The Lost Flowers of Alice Hart . Alice Parkinson as Viviane Drawmer , the children's mother.