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Early on in the series, the Doctor was identified as a human being;<ref></ref> however, his home planet, which from the start of the series is explicitly established as not being Earth,<ref></ref> was not named.In "The War Games" (1969), the Doctor's people appeared, who from then on are known as a race called Time Lords,<ref></ref><ref name="The War Games"></ref> and in "Spearhead from Space" (1970), the Doctor's earlier description of himself as a human is retconned when the Third Doctor explicitly states that he is not human.<ref></ref><ref name="Spearhead from Space"></ref> In "The Time Warrior" (1973–74), the name of the Doctor's home planet, Gallifrey, was revealed on screen for the first time.<ref></ref><ref name="time warrior 2"></ref> The nature and history of the Time Lords were gradually revealed as the television programme progressed.The Time Lords are considered one of the oldest and most technologically powerful races in the "Doctor Who" universe.