Martian Manhunter

J'onn J'onzz, known as Martian Manhunter (voiced by Carl Lumbly and Jonathan Adams) was the last Martian and one of the founding members of the Justice League. J'onn can be seen as the true founder of the Justice League, having telepathically reached out to each of the founding members, except for Batman, who nonetheless followed Superman's lead, and gathered them together.