TRON: The Next Day (2011)

TRON: The Next Day is a 10-minute short film, released on the Blu-ray edition of TRON: Legacy in April 2011, that fills in the backstory between TRON and TRON: Legacy. It features scenes from the real-world Flynn Lives ARG as well as purely in-universe content. The short film also reveals the full chronology of the Flynn Lives Organization, naming Roy Kleinberg as the secret figure heading up the operation and Alan Bradley as its financial backer. Some scenes in the short also set up the story for a potential third film.

Unfortunately the movie TRON: The Next Day is not yet available on HBO Max.