Along with Kubrick’s Napoleon, Jodorowsky’s Dune is maybe the greatest unrealized film project of all time. 21% of the film’s budget was spent during pre-production, and the script suggests the final film would have been 14 hours long. Peter Gabriel, Pink Floyd, Magma, H. R. Giger, Jean Giraud, Salvador Dalí, Orson Welles, Gloria Swanson, and David Carradine were all involved at some point.