Liga sprawiedliwych (2001)

Here is the translation of the Polish film description:

"The size of the spirit, the power of community, unyielding in the face of adversity - these are the key threads that play out in the world of "Justice League". The 2001 series that appeared on screens was a dark, action-packed and adventurous tale of a group of incredible super heroes who come together to fight against evil and take on incredibly dangerous foes.

In the heart of the world, cosmic beings invade, seeking to extinguish the light of the sun and bring darkness to the earth. In response to this danger, "Justice League" is formed, consisting of the greatest heroes from across the universe - Superman, Batman, Flash, Green Lantern, Wonder Woman, Diana (from the Amazonian kingdom), and Jack, from a distant planet. Together, they fight against cosmic monsters, and later against an array of even more dangerous enemies.

"Justice League" is aimed at all those who love adventure, action, and dark, suspenseful stories. It's a series geared primarily towards young people and adults seeking exciting tales and incredible characters. If you're looking for your next favorite show, "Justice League" is an excellent choice. The series stands out with its incredibly rich environment and diverse characters, making it a captivating and engaging watch.

Of course, "Justice League" is a dark series, but not one that evokes fear. The atmosphere in the show is dynamic and full of tension, which makes it a thrilling experience."