Cassie, Abigail, and Joy learn the origins of the purple pouches of soil but this revelation brings more questions than answers. Cassie’s foster brother Vincent goes in search of his birth mother and makes another connection instead. All of Middleton flashes back to the fabulous ’50s for a “Grease”-themed movie night in the park, with everyone dressed in poodle skirts, leather jackets and saddle shoes as they gather for a fun night under the stars that ends with an unexpected romantic gesture.