Mighty Morphin' Power Rangers

Manufacturer: BanDai
Genre: action/platform/adventure
Planned release date: in JPN Fall 1996 & in the USA Winter 1996/early 1997

Is the existence of a prototype confirmed: Not yet...
... A Demo/Proto has been rumored to have been on display for play at a 5 year anniversary videogameshow in 2000 in Japan (this might be a hoax of multiple copies of this unreleased game, this was never confirmed).

Note: Although listed in the American Nintendo Power magazine for 3 months from November 1995 to January 1996, there was no "Power Rangers" game announced for Virtual Boy by Bandai, only for SNES.