The War of the World (Orson Welles)

Following his debut in Citizen Kane, Orson Welles wanted to do a film adaptation of H.G. Wells' novel The War of the World, and his infamous radio program of the same name.

Plot
Would've been based on the novel.

Why It Was Cancelled

 * George Pal had already developed his own adaptation of War of the World for a long time.

Results

 * Orson Welles' version is cancelled.
 * The War of the World movie was released in 1953.