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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.

Band sign-ups ignite Monster High with excitement as Phantom Fever spreads through the studentbody. Venus launches self-scare kits to calm nerves while Skelita investigates the Undead’s origins. A discovered archive photo confirms the Undead vanished decades ago after performing on acursed stage. As competition escalates, the school literally begins to crack under the pressure.

Frankie leads the Voltage Shocks onto the Phantom Stage, delivering an electrifying performancethat secures a finalist spot. But as their rivalry with the Undead intensifies, strange personality shiftsand icy glares hint at possession. Robecca discovers her Timespindle appears in an old photo ofthe vanished band. The stage’s curse tightens its grip.

A spell from Skelita backfires during rehearsal, causing Venus, Abbey, and Draculaura to swapbodies—and powers. While navigating chaos and comedy, the trio gains empathy for one another’sstrengths. Though the spell is reversed, rumors spread about Robecca’s connection to the past.Meanwhile, Draculaura begins showing signs of darker change.

Bad luck plagues Ghoul Squad as Robecca partially reactivates the Timespindle and recallsfragments of the Phantom Stage's origin. When Ghoul Squad performs, their unity briefly breaksthe curse's hold. But as the hype meter peaks, Draculaura fully succumbs to obsession and flees,choosing fame over friendship.

Draculaura embraces her villain era, reveling in newfound powers and spotlight dominance. Herfriends attempt an intervention through a public dance challenge, but she rejects them. Lightningcracks through Monster High as the stage's corruption escalates. Bloodgood awakens, realizing the crisis can no longer be ignored.