"The League of Extraordinary Gentlemen," released in 2003, failed primarily due to a combination of factors, including a convoluted plot, poor pacing, and underdeveloped characters. Despite having a star-studded cast, the film struggled to capture the essence of the original graphic novels by Alan Moore. Additionally, production issues, including conflicts between director Stephen Norrington and the studio, led to significant changes and a lack of cohesive vision. The film's poor reception and low box office performance resulted in its status as a critical failure.

No, there has not been a sequel to "The League of Extraordinary Gentlemen." The film, released in 2003 and directed by Stephen Norrington, was based on the comic series by Alan Moore and Kevin O'Neill. Despite some initial interest in a sequel, the film received negative reviews and performed poorly at the box office, which led to the project being shelved. There have been discussions about reboots or adaptations of the source material, but as of now, no official sequel has been made.

"The League of Extraordinary Gentlemen" is not part of either Marvel or DC Comics. It is based on a comic book series created by Alan Moore and Kevin O'Neill, published by America's Best Comics, an imprint of Wildstorm, which is a subsidiary of DC Comics. However, the story features characters from various classic literature sources, such as Captain Nemo and Dr. Jekyll/Mr. Hyde, rather than original comic book superheroes. The film adaptation was released in 2003.

No, Van Helsing is not directly connected to "The League of Extraordinary Gentlemen." "The League of Extraordinary Gentlemen," released in 2003, is based on a comic book series by Alan Moore and features characters from various literary works, such as Allan Quatermain, Dr. Jekyll/Mr. Hyde, and Captain Nemo. Van Helsing, a character from Bram Stoker's "Dracula," is a separate figure and is not part of the League's ensemble in the film or comic. However, both share a common theme of incorporating classic literary figures into new narratives.