Spock/Appendices/Background information/Animated depictions

For approximately half an hour while was in early development, a boyhood version of Spock was considered for inclusion as a regular character in the upcoming series, along with other child equivalents of the series' main characters. (The Art of Star Trek, pp. 42 & 43)
While initially developing , D.C. Fontana realized she wanted to feature Spock in the story, since he had always been her favorite main character and was the focus of her favorite episodes from the ones she had written for , such as and . (Star Trek - Where No One Has Gone Before, p. 56) She was excited by the prospect of showing "part of what made Spock Spock," delving into his backstory in "Yesteryear". (Captains' Logs: The Unauthorized Complete Trek Voyages, p. 97)