“From the moment the invaders arrived, they were undone, destroyed by the tiniest creatures that God in his wisdom put upon this Earth. By the toll of a billion deaths, man had earned his immunity, his right to survive among this planet's infinite organisms. And that right is ours against all challenges. For neither do men live nor die in vain.”
Morgan Freeman - Narration

“- Uncle Martin: Martians use 100% of their brain while humans only use 10%.
- Tim O'Hara: No, we're smarter than that.
- Uncle Martin: Your astronauts pee in their spacesuits. Case closed.”
Chris Lloyd - Uncle Martin
Jeff Daniels - Tim O'Hara

“In the 13th Century, man was happier and more comfortable in his world than he is now. I'm speaking of psychic man and his relationship with his whole universe.”

Claude Rains - Dr. Alexander Tower

“In this modern complicated world, man breaks down under the strain, the bewilderment, disappointment, and disillusionment. He gets lost, goes crazy, commits suicide.”

Claude Rains - Dr. Alexander Tower

“I don't know what's going to happen to this world in the next hundred years or so, but I can guarantee you life isn't going to get any simpler. Worry and doubt bring on a bellyache. Mankind's building up the biggest psychic bellyache in history.”

Claude Rains - Dr. Alexander Tower