Theo Merton Jr. and Luc Maxwell, two kids who are unaffected by a time loop that repeats the same Monday every day, decide to spice things up and do the unthinkable: End the Loop and change it to a different day in the summer! Just like before, they loop every Monday in the summer, until they decide to go to a place that's filled with mysteries in Oregon: Gravity Falls! They'll soon realize that this Monday won't be like the rest!