The movie features the voice of Jenny Slate who is the voice is Tammy in Bob's Burgers: The Movie and she also lent her voice to The Secret Life of Pets 2, it also features the voice of Isabella Rossellini who is probably best known for the 1986 movie Blue Velvet.
The movie is directed by Dean Fleischer-Camp, it is a feature debut for the director but this is based on hit short story of the same name.
Movie Synopsis
Marcel, a 1-inch-tall shell, lives with his grandmother, Connie, the only residents of their town after their neighbors' sudden, mysterious disappearance. When discovered by a guest amongst the clutter of his Airbnb, the short film he posts online brings Marcel millions of passionate fans and a new hope of reuniting with his long-lost family.
BBFC certificate breakdown.