In the Justice League movie marketing, the phrase "Unite the Seven" came up frequently. However, as I count the members that have been confirmed to be appearing, only six come up: Batman, Wonder Woman, Superman, Cyborg, Flash, and Aquaman. Is there a seventh one that I am missing? Am I just being stupid?
We've already seen six of the seven classic comicbook members of the Justice League; Superman (Henry Cavill), Batman (Ben Affleck), Wonder Woman (Gal Gadot), The Flash (Ezra Miller), Cyborg (Ray Fisher) and Aquaman (Jason Momoa).
The one who's missing from the classic lineup is of course The Green Lantern who's yet to appear in any recent DCU property and may or may not do so in the finalised cut of the film given how poorly the 2011 Green Lantern stand-alone film fared.
You may wish to note that the Phrase "Unite the Seven" was only used in conjunction with Aquaman, leading to fan theories that the seven may refer to the seven seas rather than the seven members of the JLA. Also, the actual phrase seems to have been quietly dropped by the marketing folks at DC and there's been zero (official) activity on the hashtag for nearly a year.
Green Lantern is often listed as the seventh major member.
“Every beat of the movie is not yet worked out. So there’s the possibility that he may or may not be in Justice League 2,” Roven says. “For now, we felt that we were introducing enough characters that the best possible place we could put Green Lantern is some introduction in Justice League 2, or barring that, a movie after.”
After that, speculation has ranged from Martian Manhunter to Shazam. The last may actually be likely since Dwayne Johnson has reportedly been seen on set, and is slated to play Black Adam in the Shazam movie.
The Green Lantern is the missing member of the Justice League. Take a look at the picture on this Movie Pilot article, which explains the true meaning of the term "Unite the Seven."