Naming TNG episode: Episode 2x16 - Q Who

First appearance: An Appropriate Mount (TNG S2E15)

From Amazon's episode description of the episode "Q Who":

The crew is hurled into the future by the malevolent Q, who sets them up for destruction by a race of half-human, half-robot aliens known as the Borgs.
The added S, for reasons unexplainable by science, makes it roughly 12x funnier.