In the movie Killer Cheer Mom, Riley is a new student at her high school and immediately notices the cheerleading squad and their success. However, after several cheerleaders are expelled or injured, Riley begins to suspect that her stepmom, who happens to be the cheerleading coach, might be behind the incidents.
As Riley investigates further, she discovers that her stepmom has a dark past and a history of dangerous behavior. With the help of her friends, Riley uncovers evidence linking her stepmom to the mysterious incidents and must confront her before more harm is done.
The movie is a thriller that delves into the competitive world of cheerleading and the lengths some will go to keep their team on top. It stars actresses Bree Turner as the titular "Killer Cheer Mom" and Alyvia Alyn Lind as Riley, the determined protagonist who uncovers the truth.