Joining High are Gabrielle Nevaeh Green (All That, Nickelodeon’s Unfiltered, Gremlins: Secrets of the Mogwai) as Sadie; Peyton Perrine III (Funny Married Stuff)as Sadie’s brother, Marky; Tiffany Daniels (Station 19, Grace and Frankie) as Sadie’s mom, Trish; Thomas Hobson (Sherman’s Showcase, The Fresh Beat Band) as Sadie’s dad, Bryce; and Caleb Brown (Mother’s Day, The Odd Couple) as Lay Lay and Sadie’s classmate, Jeremy.