Check out Dream, the unreleased predecessor to Banjo-Kazooie

Banjo-Kazooie was one of the most successful Nintendo 64 games of its time, but it has roots in a much older game from Rare that was never released to the public. In digging around their development history with over 20 years of franchises, Rare has found unreleased footage of a Super Nintendo game called Dream, the precursor to the Banjo-Kazooie series.

The game was originally in development for the SNES before being pushed to the N64 and the remains of it are what became Banjo-Kazooie.