You were right. The whole speech was on the recorder, the last tape.
6 seconds sound clip from the The Angry Red Planet movie soundboard.
You can hear this line at 01:19:07 in the Blu-ray version of the movie.
Quote context
[...]
- Then, subject Tom to electric shocks, just short of being harmful to him.
- Better hurry and get out of that bed, Colonel, sir. Broadway's waiting.
- Just like to know if I can cash my rain check?
- I have something I want you to hear.
- You were right. The whole speech was on the recorder, the last tape.
- I think you should listen to it. Sounds important. Judge for yourself.
- Men of Earth, we of the planet Mars give you this warning. Listen carefully and remember. (2)
- And now, you have invaded our home.
[...]