[s1e1] Secret Origins : Part I -

The episode ends on a high-stakes cliffhanger as the military personnel surrounding them transform into white-skinned alien invaders, leveling their weapons at the trio. "Secret Origins" | DC Animated Universe | Fandom

As massive alien "walkers" begin crashing into major cities like Metropolis, even the combined might of Superman and Batman proves ineffective. Haunted by psychic visions, Superman eventually flies off to a secret military base, where he and Batman discover a green-skinned alien prisoner who may be the planet's only hope: , the Martian Manhunter. [S1E1] Secret Origins : Part I

In the pilot of the Justice League animated series, "," the world’s greatest heroes are forced together when an ancient alien threat finally reaches Earth's shores. The story begins on Mars, where an ill-fated astronaut named J. Allen Carter uncovers a massive door in an underground cavern, accidentally releasing a shapeshifting alien force that has been imprisoned for centuries. The episode ends on a high-stakes cliffhanger as

Two years later, Batman discovers a security breach at a deep-space monitoring facility, leading to a clash with mysterious, super-strong "scientists". At the same time, Superman champions a global nuclear disarmament plan proposed by the now-Senator Carter, unaware that it is a strategic move to leave the world defenseless. In the pilot of the Justice League animated