Spock vs. Q

Ambassador Spock travels back in time to subtly warn Earth's inhabitants of impending doom while calling into question humanity's priorities. However, before the truth is told, the all-powerful being, Q, appears and reminds Spock that he is prohibited from interfering in Earth's history. Besides, Q doesn't see mankind as something worth saving.

The battle of wits and logic is joined again! Spock and Q are in the midst of debating the fate of mankind when they are suddenly transported to somewhere in deep space. Then a curious personality change begins to take place, as Spock is overcome with giddy delight and Q begins to act serious, even logical. Masterfully performed by Leonard Nimoy and John de Lancie!