After being telepathically summoned by (Martian Manhunter), a diverse group of heroes converges to rescue him and Superman from a military base overrun by shape-shifting invaders. The team includes:
The invaders, who are nocturnal and find sunlight fatal, begin constructing massive factories to shroud Earth in perpetual darkness. To stop them, the heroes split into teams to sabotage these facilities: Episode 2: Secret Origins (2)
Watch a quick summary of the heroes' first major battle against the alien invaders in this recap video: Justice League Secret Origins Recap in 90 Seconds! Andy Knode YouTube• Aug 15, 2023 Justice League (TV Series) Episode: Secret Origins, Part II Andy Knode YouTube• Aug 15, 2023 Justice League
The episode ends on a grim cliffhanger: while Wonder Woman escapes with an injured J'onn, inside the exploding facility and is believed by his teammates to have perished. Andy Knode YouTube• Aug 15
In the second part of the Justice League premiere episode, "," the world’s greatest heroes finally unite to combat a global alien invasion. The Heroes Assemble
successfully destroy one factory, though Flash briefly gets stuck in alien goo.