'Marcel The Shell With Shoes On' is the feature adaptation of Dean Fleischer Camp and Jenny Slate's popular series of short films and New York Times-bestselling books, and marks the big screen debut of the internet's most beloved mollusk. When struggling filmmaker Dean (writer-director Dean Fleischer Camp) moves into an Airbnb, he quickly discovers that he is not alone. Marcel (Jenny Slate), an adorable one-inch-tall shell, already lives there with his grandmother Connie (Isabella Rossellini) and their pet lint,…