Star Trek: The Next Generation

Deja Q - S3-E13

Question: Why does Guinan have an intense hatred for Q?

Chosen answer: He brought the Borg to the Alpha Quadrant and showed them that it was full of worlds waiting to be assimilated. Guinan's homeworld was their first stop, and they assimilated everyone and took over the planet, leaving the survivors of her race without a home. Q is ultimately responsible for that.

Captain Defenestrator