And on that front, within a zany romp episode, “Human Best Friend” does explore a huge emotional foundation of one all-important Star Trek relationship: Kirk and Spock. Warning: Spoilers ahead for Strange New Worlds Season 4, Episode 3, “Human Best Friend” below! “Human Best Friend” ending explainedKirk lives rent-free in Spock’s mind. That moment foreshadowed the Kirk-Spock friendship in a big way, and now, with Strange New Worlds Season 4, “Human Best Friend” is providing another layer. Is Spock saying “human best friend” in Strange New Worlds the new canon version of t’hy’la?