Peter Q Taggart wrote:

Is the full color version of "The Cage" that was released later just colorized from the B&W footage? A friend of mine insisted this was the case and not the "full color version found in a vault" as it was advertised.
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According to
http://startrekhistory.com/cagepage.html the unused portions from "The Menagerie" were found in 1987. The Star Trek History site is reliable and I see no reason to doubt it. The alternating Keeper voices were used since the found footage had no soundtarck.