You know the terrible things that have happened when Ro-Man landed on earth. The only reason we are still alive is that your sister Alice and I worked out a way to reflect his deadly beams away from the house.
14 seconds sound clip from the Robot Monster (1953) movie soundboard.
You can hear this line at 00:17:50.911 in the Blu-ray version of the movie.
Quote context
[...]
- Martha, it's all right! He's here!
- Anger won't keep the boy from doing it again. We must tell him why.
- Saw who?
- Ro-Man. He's in the cave at the end of the ravine.
- Not yet, or we'd all be dead by now. Are you sure?
- I was in the cave, painting his picture the way we saw him on the viewer screen.
- Why were you doing that, Johnny?
- So in case he did wipe out the human race, there'd be some record of how it happened.
[...]