But I must know if I am the only unicorn left in the world.

5 seconds sound clip from the The Last Unicorn movie soundboard.

You can hear this line at 00:10:59.584 in the Blu-ray version of the movie.

Quote context

[...]

- Listen, listen! The king is in the counting house, counting out, counting out, counting...

- It's you or me, moth! Hand to hand to hand to hand to hand to hand...

- He said I could find the other unicorns. But where?

- Or was the story of the Red Bull just another of his songs?

- Oh, I could never leave this forest.

- But I must know if I am the only unicorn left in the world.

- Suppose they are hiding together, somewhere far away?

- What if they're waiting for me, in need of my help?

- They passed down all the roads long ago, and the Red Bull ran close behind them and covered their footprints.

- I must go quickly, and come back as soon as I can.

[...]