Our only hope is that towering power for right and justice the Caped Crusader.

7 seconds sound clip from Batman (1966) - True or False Face (S1E17) TV Series.

You can hear this line at 00:03:08 in the Blu-ray version of the movie.

Quote context

[...]

- The crown. Phony. Utterly worthless.

- False Face has struck deviously and ruthlessly.

- Can't we stop this master of devilish disguises?

- Commissioner, there's only one man living who can unmask False Face.

- Chief O'Hara, you've said it for all of us.

- Our only hope is that towering power for right and justice the Caped Crusader.

- I'll call him, sir.

- Pine. Elm. Hickory... Gosh, botany is tough. I'll never learn to recognize all these trees.

- Come, come, Dick. Pine, elm, hickory, chestnut, maple...

- Part of our heritage is the more of living things. The story book of nature.

[...]