During the Monster High Legacy Showcase, Frankie accidentally supercharges Robecca’s Timespindle, causing a mysterious Phantom Stage to rise from the lawn. A vintage flyer reveals the return of the long-forgotten Battle of the Bands. As chaos unfolds, a massive shadow hints that something from Monster history has resurfaced—and it’s only just beginning.

With the Phantom Stage looming over campus, Headmistress Bloodgood distracts students with asurprise creepover. Three memory-less newcomers—Chord, Clave, and Cymbelle—arrive undermysterious circumstances. Draculaura discovers she can understand Cymbelle’s ancient language,deepening the mystery. As suspicions grow, it becomes clear the new students are connected tothe stage—and to a forgotten past.

Robecca and Frankie experiment with activating the Phantom Stage despite Bloodgood’s warnings.The new trio instinctively perform, and the stage selects them as “The Undead,” triggering a surgeof dark energy. A flash of Bloodgood’s past suggests history is repeating itself. As the Undead’seyes glow with possession, the Battle officially begins.