JoJo's Bizarre Adventure: Phantom Blood (partially found anime film; 2007)
JoJo's Bizarre Adventure: Phantom Blood was a 91-minute animated feature film released on February 17th, 2007, that was based off the first part of Hirohiko Araki's long-running manga series JoJo's Bizarre Adventure. It was produced by Studio APPP, with Junichi Hayama serving as director, sound design by Tom Myers of Skywalker Sound, and an end theme/promo song titled "Voodoo Kingdom" by Japanese hip-hop band SOUL'd OUT. The film itself was made in celebration of both the 25th anniversary of Araki's career as a manga artist and the 20th anniversary of JoJo's Bizarre Adventure.
Phantom Blood was only ever publicly shown in Japanese cinemas, with its last known screening taking place on the 24th of February 2007, before being promptly and indefinitely shelved. The reason behind this has never been officially revealed, though it is largely assumed to have been the result of Studio APPP neglecting to give a number of characters enough screen time, including Speedwagon, one of Araki's favorites, as well as the film generally not doing the story justice, which ultimately led to negative reception from both fans and the creator.
Notably, the shell of the film's now-defunct official website can still be accessed via The Wayback Machine, although most of the site's content appears to be inaccessible. The website can still be accessed today with the same link, but be warned as it is now an NSFW Japanese site and does not feature the same contents someone would think.
While the film remains unreleased, several dozen screenshots exist as well as roughly 18 minutes of footage in the form of two trailers and a 16-minute collection of various scenes without dialogue. The collection surfaced online in 2012 after allegedly being given out to an Academy of Art University student by their professor (who apparently had connections to those who worked on the film) as part of a sound design project.
Possible Jump Festa Short Preview
In 2007 and 2008, before the film became infamous for its unavailability, several screenshots rumored to have been taken from a screening of the film circulated on fan forums. In one thread, user BlackHoleSun claims that the screenshots, including one showing fan-favorite Robert Speedwagon, were actually from a short animated for a Jump Festa preview, and that Speedwagon was excluded from the actual film. 
Though the claim would normally not be credible on its own, there are several severe discrepancies between the batch of screenshots purported to be the short and the final film, including different character designs and outfits. This, along with the images only covering a very small and specific selection of scenes, lend some credibility to the existence of at least some compilation of animation that was not used in the final film.
- SOUL'd OUT's Voodoo Kingdom, used as Phantom Blood’s ending theme. Retrieved 09 Mar '15.
- JoJo's Bizarre Encyclopedia article on the film. Retrieved 09 Mar '15.