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Star and Marco need Janna's help to return to Mewni.
Tom breaks up with Star but is not prepared for the consequences.
Star, Marco, Janna and Tom lose their memories as they traverse amnesia-inducing waters to get back to Mewni.
In the fourth and final season, teen princess from another dimension Star Butterfly and her best friend Marco Diaz will face unusual surprises brought about by Mewni's new ruler Queen Eclipsa.