As early as 1961 Gemini (or Mercury Mark II as it was called at the time) was considered, by it's contractor and some at NASA, as an alternative or shortcut to the Apollo lunar lander. Proposals were made to boost the Gemini to a lunar flyby as early as 1965, with a lunar landing as early as 1966. It would have cost a fraction of the amount spent on Apollo, and the higher ups at NASA, and especially Von Braun, saw it as a threat to the Apollo program, and any mention of a lunar Gemini was limited to internal studies. This video represents the final incarnation of the Gemini lander, as a rescue vehicle for Apollo, atop the cancelled Saturn C3B launch vehicle, which could support a two man directascent mission to the Moon.
For more on the lunar Gemini proposals: http://www.astronautix.com/articles/b...

Music:
Sea of Sand Ethan Meixsell
Hero Down Kevin MacLeod