" One of the weapons Marvel used in its climb to comic-book dominance was a willingness to invent new characters at a dizzying speed. There are so many Marvel universes, indeed, that some superheroes do not even exist in one another’s worlds, preventing gridlock. "
- Roger Ebert

The quote discusses Marvel's strategy in becoming a dominant force in the comic-book industry by constantly introducing new characters at an incredibly fast pace. This approach has led to numerous distinct universes within the Marvel universe, where some superheroes exist exclusively within certain realms and not others.

On a deeper level, the quote highlights the innovative and dynamic nature of Marvel’s storytelling, which allows for endless possibilities while maintaining rich, complex narratives. By creating separate worlds with unique characters and storylines, Marvel ensures that there is always something new and exciting for fans to explore without overwhelming them or causing confusion due to overlapping plots. This method also helps in managing a vast array of superheroes by compartmentalizing their stories, thus preventing narrative congestion.

The quote was written by Roger Ebert, a renowned film critic and author who had an extensive career spanning several decades. Known for his insightful reviews and articulate writing style, Ebert often applied his critical thinking skills to various forms of media beyond cinema, including comics and literature. His perspective on Marvel reflects the broader impact of its storytelling methods across popular culture.