Zack Snyder's Batman v Superman: Dawn of Justice. In Zack Snyder's original plans, Swanwick was going to be revealed to as J'onn J'onzz in Justice League, and the Snyder Cut will finally show him in his Martian form.
J'onn J'onzz is essential to the Justice League, as he's one of the wisest and most influential heroes in the team - to the point that he's prepared to restrain Superman if he ever goes rogue. But even outside the League, he has plenty of exciting stories in more than sixty years of comic book history. They range from the death of his entire race, his brief stint as a human detective, and his place in a universe that doesn't understand his true form. His extensive list of superpowers such as shapeshifting and invisibility also offers countless narrative possibilities, as well as his vulnerability to fire. It's quite odd that such a fascinating DC character has been so underutilized on the big screen.
Thankfully, Zack Snyder's Justice League will give J'onn J'onzz an opportunity to shine. Martian Manhunter's adventures with the Justice League in the DCEU might end there, since future ensemble movies are unlikely to happen - at least not with the same actors. However, the Aquaman 2. Therefore, fans can't rule out a Martian Manhunter movie, which could be set on Earth or in the most distant corner of the universe.
If a Martian Manhunter movie were to happen, there are many paths the story can take. It can explore the tragic death of J'onn J'onzz's family as a more intimate version of the destruction of Krypton, or it could also be a film noir murder mystery that's grittier than any Batman movie ever made. Of course, it can also take a more conventional approach with an action-packed battle against J'onn Jonzz's archnemesis Despero, or a team-up with Green Lantern, Flash, or Miss Martian. In short, there are countless creative possibilities regarding Martian Manhunter, and all of them could produce a film unlike anything DC has ever done before.
David Harewood's interpretation of J'onn J'onzz in Supergirl is one of the most charismatic in the Arrowverse. Yet, the CW has only explored a tiny amount of the character's lore — enough to allow a DC feature to tell a vastly different story, similar to what Andy Muschietti's The Flash is expected to do with the big-screen version of Barry Allen. Zack Snyder's Justice League could be the jumping point for many new DC properties that could help improve the DCEU.
