A day at the beach became a nightmare for teenager Alison Hooper (Julia Blanchard) when she sees a shark appear by her younger brother Kevin (Brayson Goss) while he was out in the ocean tubing. Alison leaps into the water to save Kevin, with the siblings narrowly avoiding the shark's clutches--thanks in part to the actions of dockhand Daniel Kennedy (Houston Stevenson).
Moving with her parents from Colorado to California has been hard on Sierra Reynolds (Taylor Blackwell). But upon her arrival in Calabasas, things seem to look up when she attracts the attention of Lexi Cooper (Avery Kristen Pohl), the queen bee of Sierra's new school. But as Lexi and her friend Kaitlyn (Lauryn Speights) begin to integrate Sierra into their clique, Sierra takes wary notice of Lexi's penchant for pulling pranks and ostracizing those she believes cross her.
For Lisa Clark (Sarah Butler), her life has gotten somewhat back on track following her father's death in an unsolved hit-and-run. With a stable job, supportive friends, and a doting mother in Barbara (Joely Fisher), the only trouble Lisa finds herself dealing with in the present comes in the form of her love life. Fresh off a break-up from her cheating boyfriend Bobby (Charlie Gorrilla), Lisa is ambivalent on re-entering the dating scene, in spite of goading from Barbara and her best friend Abby (Samantha Cope).
For Leo Borlock (Graham Verchere), the small town of Mica, Arizona is one of those towns where nothing happens. That was the way it was when he moved there after his father's death, leading him to go out of his way not to stand out after his habit for wearing his father's favorite tie made him a target for bullies. But in his junior year, everything changed with the arrival of a new student: a girl who goes by the name "Stargirl" (Grace VanderWaal, in her film debut), who quickly captures Leo and the rest of the school's attention for her unconventional clothing and odd habits.
As part of a Crowdfunding campaign for his upcoming film, Angel Connell (ironically played by the film's writer and director of the same name) has offered a prop as a perk for a lucky generous funder: the Donald Trump fetish doll that plays a significant role in his movie.
Apart from her divorce from her sheriff husband Steven (Ryan Robbins), deputy mayor Judy Dwyer (Erin Karpluk) is doing her best to keep herself together for her own sake and the sake of her daughter Abbey (Morgan Kohan). But her efforts are shattered when her best friend and the mother of Abbey's boyfriend Kendra Wilson (Alison Brooks) is murdered, leaving Judy devastated and Kendra's son Daniel (Bradley Hamilton) facing interrogation from Steven.