 The rest of the movie, which was meant to serve as an introductory episode of a series, deals with the main characters coping with the loss of their friend and organizing a search-and-rescue mission, while secondary characters allow the viewer to explore various facets of life in the city.The movie touches on many themes including genetic experimentation, virtual reality, and state-controlled marriages.Citizens of the city wear a colored crystal on their sternum based on the individual's genetic makeup, and can mate only with other citizens of the same color.