>>97282422Teenager Star Butterfly is the future queen of Mewni, one in a long line of women to fight hostile supernatural entities called monsters. Distraught over the death of her friend Jackie Lynn Thomas, Star visits her best friend Marco Diaz in a hospital and masturbates to his comatose body.
The shadowy Magical High Commission has discovered that former monster commander Toffee intends to use the royal wand, an heirloom passed down from the first Butterfly for his own plans. The MHC dispatches Rhombulus to seize control of the wand, imprisoning most of the kingdom in crystals. Mewni's former greatest warrior and tenuous ally Mina Loveberry orders Marco moved to Hekapoo's dimension as it would be the last place they would look for him, then rescues Star from Rhombulus. Determined to have Star defend Mewni, Mina brings Star to Moon Butterfly's hidden armory, but is partially frozen in the process. Before her complete crystalization, Mina implores Star to use the wand, calls her "my mud sister", and forces her into the safe room. Star discovers an assortment of powerful artifacts frozen in crystal.
Concluding that Mewni's defeat is inevitable, Toffee retrieves Eclipsa. He plans to use her to initiate Third Impact, a cataclysm which will kill everyone on Mewni, and reunite with his deceased wife [REDACTED]. Attempting to stop him, King River Johansen leads barbarian shock troopers to recapture Eclipsa. Moon, attempting to capture Eclipsa and put down Toffee again before all of Mewni is crystalized by Rhombulus' assault, is killed by the Septarian.
Inside Hekapoo's dimension, Marco overcomes his trauma and fully activates his Dimensional Scissors in Hekapoo's forge. He defeats Rhombulus, but Hekapoo and Omnitraxus overpower him. Star breaks free the crystalized artifacts using her Butterfly form, and ascends over Mewni. From the sky, Star meets eyes with Hekapoo and Omnitraxus, holding Marco's torn hoodie as a flag, and screams.