Child actor who provided the voice of the seven-year-old Spock in the acclaimed animated Star Trek episode Yesteryear, written by D.C. Fontana.
Billy Simpson was a child performer of the early 1970s whose Star Trek credit is the voice of young Spock in Yesteryear (1973), the second episode of Star Trek: The Animated Series.
In the story the adult Spock travels through the Guardian of Forever to Vulcan's past to save his own life, posing as a cousin named Selek. Simpson voices the boy he meets there: teased by other children for his human blood, anxious to prove himself in the kahs-wan survival ordeal, and devoted to his pet sehlat, I-Chaya.
The boy's decision to let the mortally wounded I-Chaya die peacefully marks his choice of the Vulcan way. Leonard Nimoy voices the adult Spock opposite him, and Mark Lenard returns as Sarek.