"The Venture Bros.: All This and Gargantua-2" is a movie that serves as a continuation of the series "The Venture Bros." It is not tied to a specific season but acts as a direct sequel to the events of the show, particularly the series finale of Season 7. The movie was released in 2023 and aims to wrap up the long-running storylines and character arcs of the series.

Yes, "The Venture Bros." Season 8 was ultimately canceled. Although the creators had initially planned for an eighth season, it was announced in 2020 that Adult Swim decided not to move forward with it. However, the show returned with a movie titled "The Venture Bros.: All This and Gargantua-2," which was released in 2023. The film serves as a conclusion to the series and wraps up various storylines introduced throughout the show's run.

"The Venture Bros." is a parody of various elements of adventure and superhero genres, particularly drawing inspiration from 1960s and 1970s cartoons like "Jonny Quest." It satirizes themes of masculinity, family dynamics, and the tropes of super-science and espionage. The series blends elements of pop culture, comic books, and adventure storytelling, critiquing the conventions of these genres while incorporating humor and character depth. Its unique style combines absurdity with heartfelt moments, creating a distinctive narrative.

David Bowie did not appear in "The Venture Bros.: All This and Gargantua-2" or in the original series. However, his influence is felt throughout the show, particularly in the character of the "Sovereign," who is a nod to Bowie’s persona. The series often pays homage to various pop culture icons, and Bowie’s legacy in music and style fits well with the show's eclectic themes. The Venture Bros. features many references to Bowie and his work, but Bowie himself never voiced a character in the series.