Martian Manhunter Actor Wants a J'onn J'onzz Detective Movie Spinoff Share Martian Manhunter Actor Wants a J'onn J'onzz Detective Movie Spinoff Martian Manhunter actor Harry Lennix from Zack Snyder's Justice League wants his character to get a detective movie spinoff. One of the biggest additions to the DCEU with the release of Zack Snyder's Justice League was the reveal that the character of General Swanwick, played by Harry Lennix, was actually the Martian Manhunter all along. While the Manhunter only had a brief cameo in the movie, fans responded positively to his appearance. When asked during Justice Con about appearing in future DCEU projects, Lennix suggested a detective movie centered around the Martian Manhunter.