A possible soundtrack leak from Justice League may confirm that at least one more hero will be joining the team by the end of the film. Ever since Warner Bros. announced that they were building a cinematic universe of their own, fans of the DC comics have wondered who would make up the first roster for the Justice League. Mainstays like Superman (Henry Cavill), Batman (Ben Affleck), Wonder Woman (Gal Gadot), and Flash (Ezra Miller) were sure to be included, but they'll also be joined by Aquaman (Jason Momoa) and Cyborg (Ray Fisher).

While the marketing for Justice League has only shown five of them in action (Superman is still dead after Batman V Superman: Dawn of Justice), most know that the team will be (at least) six strong by the end of the film. Throughout production, rumors of Green Lantern, Shazam, and others joining have persisted, and may be confirmed with a new soundtrack listing.

Related: Where is Green Lantern During Justice League?

Reddit is not typically a reliable source for news, but this is a different case. The subreddit dedicated to the band Imagine Dragons posted a screenshot of Justice League's IMDB page a few weeks ago, where the band was listed as part of the film's soundtrack. This is hardly surprising given their established relationship with the DCEU, but the track they're responsible for is noteworthy. While IMDB has since deleted this listing, as shown below, Imagine Dragons is credited to do a song titled 'Unite the Seven.'

With only six Justice Leaguers confirmed to appear so far, it could in fact be this listing (if accurate) that confirms someone else is joining the roster. Since anyone can submit information to IMDB, there is no telling if it is true. But, since the track has yet to be officially announced, WB and Imagine Dragons would not want that information to leak ahead of time like this and could have had it removed. Then again, they would want the same exact thing if it was completely false. However, since their songs were used for Suicide Squad and Wonder Woman, their connections could add some credibility to this.

If there is indeed a seventh member of the Justice League coming to the film, the best guess is that it will be a Green Lantern. With both John Stewart and Hal Jordan said to be in Green Lantern Corps, either could be on the table. But, Hal is reportedly going to be the veteran of the duo so he could journey to his home world to help protect it from Steppenwolf and Darkseid's army of parademons. If the seventh member is not going to be Green Lantern, Shazam could be a last second addition, as could a number of well-known DC characters.

At this point, it is unlikely Warner Bros. confirms any surprise castings for Justice League as they've clearly taken extreme measures to keep them close to the vest for this long. That said, if other DC heroes are cast in the coming months (or weeks as reshoots finish), they could easily step in for a few days work and make their debut this November.

More: Superman Joins the Fight in Justice League Poster

Source: Reddit