"By exploring other worlds we safeguard this one. By itself, I think this fact more than justifies the money our species has spent in sending ships to other worlds. It is our fate to live during one of the most perilous and, at the same time, one of the most hopeful chapters in human history."

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We were lucky to get Sam Jackson and Jeremy Irons and John McTiernan back. Long movie and hard movie to make and difficult for me because instead of working, my biggest concern was not repeating things I had done it in the previous films. And it rang notes in my head of episodic TV. A sequel is not a new movie; it's a chapter in a movie that you have already seen. Thank god Sam was there and thank god Jeremy was there. Again, it went outside the template of that series of films but it did well and made a ton of dough and the third chapter of a lot of sequels is always the one that falls down.

— Bruce Willis