The character evolved from having a metal plate in his stomach through which he ingested energy to being a half-Martian in the original 1964 pitch with a "slightly reddish complexion and semi-pointed ears". Due to Roddenberry's concern that a Mars landing might take place before the end of the series, Spock's home planet was changed. Lee Greenway conducted the initial makeup tests on Nimoy, but after four or five days, Fred Phillips was asked to take over. Phillips in turn asked John Chambers to create Spock's ears, as he was working on getting an appropriate shade of red for Spock's skin; this idea was later abandoned in favor of a yellow hue because of the effects on black and white television. Nimoy hated the ears, and Roddenberry promised him that if he was still unhappy by the 13th episode then they'd find a way to write them out. The NBC executives were also concerned, as they felt it made the character satanic.