Spock Two is the twenty-five-foot duplicate of Spock grown by Stavos Keniclius 5 in The Infinite Vulcan, intended as the model for an army of peacekeepers.
Spock Two appears in the Animated Series episode The Infinite Vulcan. On the planet Phylos the giant Keniclius 5, latest clone of a scientist from the era of the Eugenics Wars, seizes Spock as the perfect specimen he has sought.
Keniclius drains Spock's mind into an enormous copy, leaving the original dying. He plans to breed a race of such giants and send them out to impose peace on the galaxy, with the plant-like Phylosians and their old fleet to carry them.
Kirk argues with the newly awakened giant, appealing to Vulcan teaching and pointing out that the galaxy is already at peace. Spock Two accepts the logic and performs a mind meld that restores his original. He then stays on Phylos with Keniclius to help revive the Phylosian people.