The first trailer for Netflix’s Black Mirror movie, Bandersnatch, has been released—and the full film will be available tomorrow. The movie is rumored to have a choose-your-own-adventure element to it, where viewers can choose their own storyline. Netflix has yet to confirm that detail but the trailer hints at it, calling the movie a “Black Mirror event” that urges viewers to change their past, present, and future. In the trailer, Fionn Whitehead’s character is seen going to work at a computer-games company and suggests creating a game based on a book called Bandersnatch, whose author is said to have “went mad and cut his wife’s head off.”