Two worlds, two lives, now one. Through fear and neglect, through hate and pain, Star and Marco must carve a path in a new world for themselves and their loved ones, facing a challenge that neither has anyone encountered. What challenges and dangers wait for the pair in a clash of worlds that they created themselves?

Because of Star and Marco's love for one another (and magic, of course), Earth and Mewni have now become one! Now that they live in...sort of a brand new world, hundreds of new adventures await them! Where will these new discoveries take them and what will they face along the way?

Join Star, Marco, and their whole interdimensional extended family, as they live and love and grow together and tackle challenges in their new world.

On this non-linear story, we pick up the events after cleaved, revisiting the characters we know and love, also adding some new ones. Each episode is set on a different time and place and has no direct narrative continuation with the previous or the next one. We get to know the fate of magic, monsters, humans, mewmans and septarians.

It's Christmas Eve and Star and Marco are enjoying the holidays. But what happens when Star learns about the tradition behind the Mistletoe? Starco centric.