Justice League: The New Frontier (2008)

It unfolds in the 1950s as a new generation of superheroes emerges. Tasked with uniting with community veterans, they face a common enemy. Against the backdrop of Cold War tension and government skepticism, the superheroes strive to save Earth. This animated film blends retro aesthetics with a gripping narrative, exploring themes of unity, heroism, and the challenges of navigating a world on the brink of change.