Justice League (Rebirth Animated Series)

The Justice League is a 2016 animated series based loosely off of the adventures of the Justice League Comic Books.

Plot
In the first episode, "Rebirth," a group of heroes answer a telepathic message which brings them before a Martian Manhunter, a police officer of mars. The martian introduces himself as J'onn J'onzz, one of the last martians left in existance. He explains that 200 years ago, the White Martians attacked his people, the Green Martians, and had left the species close to extinction. To save what was left of his people, J'onn had sealed the White Martians into a massive sphere, buried on the moon. But astronauts has recently released them by mistake, and he besieges them to help him stop the threat once again. They agree, and after the threat is defeated, they stay together to form the Justice League.

Season 1

 * 1) Rebirth (Part 1, Part 2, Part 3)