In a world where giant monsters are celebrated as superstar athletes, each town has its champion monster to compete in professional wrestling matches. The small town of Stoker, known for its legacy champion Tentacular, is suddenly in despair when Tentacular leaves for a more lucrative opportunity. This move endangers the town's economy and spirit, as it revolves around the success of its monster. Determined to save Stoker, Winnie Coyle, a spirited teenager and daughter of legendary coach Jimbo Coyle, sets out on a mission to find a new champion. She discovers Steve, a loveable but underachieving monster with raw potential, hiding far from the limelight. Despite his reluctance and poor track record, Winnie convinces Steve to train and prepare for the big leagues.

Winnie and Steve face a difficult journey as they must navigate the rigorous world of monster wrestling to prove themselves in the Monster Wrestling League. Their relationship evolves from a simple trainer-trainee dynamic to a genuine friendship, where Winnie's coaching encourages Steve to embrace his unique style and abilities. As they encounter fierce competitors and overcome various challenges, Winnie learns valuable lessons about perseverance and embracing individuality. Their pursuit brings new hope to Stoker, highlighting themes of self-discovery and community resilience. The film blends humor and heart while exploring the dynamics of belonging and personal growth, setting the stage for an epic test that will determine the future of the town and Winnie’s maternal legacy.