- Hey, a gas lighter than air?
- Must have... hydrogen in it.
- If we could electrify it.
- We can. High voltage grill. Metal buckles of our belts.

15 seconds sound clip from Batman (1966) - A Death Worse Than Fate (S1E10) TV Series.

You can hear this line at 00:20:15 in the Blu-ray version of the movie.

Quote context

[...]

- Quick, let's get that grill... Electrified.

- Holy graveyard, Batman. This could be... curtains.

- Don't quit, Robin. Let's get our heads down.

- This gas is rising. Lighter than air. We'll have a few more life-saving seconds.

- Oh, what a noble struggle!

- Hey, a gas lighter than air?

- Must have... hydrogen in it.

- If we could electrify it.

- We can. High voltage grill. Metal buckles of our belts.

- Give me your utility belt and step back, Robin.

- Alright. Here goes.

- Sensational! He has done it.

- Batman, watch out. Those mummies!

[...]