Star and Marco have cleaved their worlds together, ending the reign of magic and queens. Or so they thought. As life settles in Earth-ni, old enemies arise and new problems threaten the balance of peace and power in the new world.
Earth and Mewni have now merged into one; all because of a rebel mewman princess and human safe-kid's love for one another (and magic, of course)! Now that they live in...well, sort of a brand new world, Star and Marco have many new adventures in store! However, one question remains. Are they ready for what is coming...