The main two fancasts for the lead male role (Liam Stewart) were Lucas Till and Collin Ford.

Jennifer Yuh Nelson's 2nd live-action movie, but the 1st to be directed by her. She has done work for mostly animated movies, notably the Kung Fu Panda franchise. She first did work on a live-action movie for the art department.

Catherine Dyer and Peyton Wich have both appeared in Stranger Things as Agent Connie Frazier and Troy, respectively.

-It is based on Alexandra Bracken's young adult novel of the same name.

Alexandra Bracken, author of The Darkest Minds series, makes a cameo appearance as a nurse at the end of the movie.

-On July 12, 2016, it was reported that animation director Jennifer Yuh Nelson had been hired to direct the film, and it would be her first live-action project.