Dragon King: The Fighting Game (lost Super Smash Bros. precursor; 1990s)
The immensely popular 1999 crossover fighting game Super Smash Bros. actually began development without any ties to established Nintendo franchises under the title Kakuto-Geemu Ryuoh, which can be translated to Dragon King: The Fighting Game. Very little is known about the game, and the only pieces of evidence that proves it exists are in the form of 3 screenshots that were released in an "Iwata Asks" interview with series director Masahiro Sakurai.
It is speculated (based on the screenshots) that the nameless character of Dragon King became Captain Falcon in Super Smash Bros., as the Dragon King character appears to use some of Falcon's attacks, but there is little more hard evidence to support this theory.
- "Iwata Asks" interview in which the game is discussed at length. Retrieved 17 May '13.