While the upcoming Ghostbusters sequel hasn't begun principal photography, filmmaker Jason Reitman is already looking to the past for inspiration for the next installment of the popular comedy-horror franchise.

At Ghostbusters Fan Fest in Los Angeles, Jason and his father Ivan Reitman, who directed the first two films, unveiled previously unseen footage from the original 1984 film.

RELATED: Ghostbusters Director Confirms Original Cast Has Read the Script

Featuring largely alternate takes, the footage begins at 1:23 showing unused material between the Ghostbusters and EPA official Walter Peck in the Mayor of New York City's office. Starting at 5:19 is footage of Egon examining Louis Tully while he was possessed by the spirit of Vinz the Keymaster. 13:12 shows Venkman entering love interest Dana Barrett's apartment to investigate signs of suspected paranormal activity with his usual irreverent, deadpan approach. A completely unused bit of footage starts at 18:23 showing Ray drinking with a piece of experimental equipment in what Ivan Reitman described a B-roll transitional footage that never made the final cut. The last snippet of footage starts at 20:29 with alternate takes of the Ghostbusters exiting the haunted hotel ballroom after successfully capturing Slimer as Venkman greets the concierge with a different quip on every take.

Reitman didn't reveal why he'd been watching the footage or how he intended to use it, but it's possible the unseen reel might appear in his film in some way. Although only Sigourney Weaver is officially confirmed as returning right now, there's a pretty good indication the rest of the original cast is returning for the movie, though their role in the story isn't yet known.

RELATED: Ghostbusters: Sigourney Weaver Will Return for 2020 Film

Ghostbusters is directed by Jason Reitman (Up in the Air) who also co-wrote the film with Gil Kenan (Monster House). The film stars Finn Wolfhard, Carrie Coon and Mckenna Grace and is scheduled for release on July 20, 2020.

(via /Film)