It’s the fastest way to experience the series' high-stakes introduction.

Humanity lives behind massive walls to escape man-eating Titans.

Sets the foundation for the complex political and moral themes explored later. If you'd like to dive deeper, I can: Compare the film vs. the TV episodes Explain the ending credits scene (which teases Season 2)

Provide a for the rest of the compilation movies

The film format heightens the horror and desperation of the Titan invasion.