90 Day Fiancé is an American reality television series on TLC that follows couples who have applied for or received a K-1 visa, available uniquely to foreign fiancés of U.S. citizens, and therefore have 90 days to marry each other. The series debuted on January 12, 2014, and has run for 10 seasons.

A shared universe or shared world is a fictional universe from a set of creative works where one or more writers independently contribute works that can stand alone but fits into the joint development of the storyline, characters, or world of the overall project. It is common in genres like science fiction. It differs from collaborative writing in which multiple artists are working together on the same work and from crossovers where the works and characters are independent except for a single meeting.