As previously reported, director Ryan Unicomb and producers Aaron Cater and Steven Caldwell are planning a documentary on George Miller's failed attempt at a Justice League movie, "Justice League Mortal." To stir up interest in the project, the doc's official Twitter account has released never-before-seen concept art from early in Miller's production.

One piece of art shows the design of Aquaman, who would've been played by Santiago Cabrera of "Merlin" and "Heroes" fame. The image, which JLdoco notes is just one of many early concepts, sees the King of Atlantis protected by crustacean shell armor, and includes the solid water hand the character had during the early 2000s. JLdoco also teased that there's far less faithful designs out there, but held off on sharing more.

Ladies & Gentlemen - your King of Atlantis. #Aquaman #JusticeLeagueMortal #MillersJusticeLeagueMortal Lets go viral! pic.twitter.com/7zIh4jx2U2- Miller's JL - Doco (@JLdoco) May 30, 2015

The other two pieces of art depict action scenes with Wonder Woman, who was to be played by Megan Gale, now starring in Miller's "Mad Max: Fury Road." The first image sees Princess Diana flying over a sunset painted Themyscira, and the second features Wonder Woman stopping a falling car with her fist.

Princess Diana flies through Themyscira

#MillersjusticeLeagueMortal #JusticeLeagueMortal #Wonderwoman pic.twitter.com/LobU5m6pwB- Miller's JL - Doco (@JLdoco) May 29, 2015

Princess Diana of Themyscira - or as you may know her #WonderWoman - #justiceLeagueMortal #MillersJusticeLeagueMortal pic.twitter.com/GT4ldjCzBr- Miller's JL - Doco (@JLdoco) May 30, 2015

Update: JLdoco has shared another piece of concept art, this time of a head sculpt for Martian Manhunter:

"I am Mars' sole survivor. There is a reason for that." - J'onn J'onzz - The Martian Manhunter. #JusticeLeagueMortal pic.twitter.com/myHMjdiukz- Miller's JL - Doco (@JLdoco) May 31, 2015