20 Million Miles to Earth (1957)

[on the plan to capture the alien creature with a huge net]
Col. Robert Calder: Doc, this is like a parachute. It's got to work the first time!

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[last lines]
Dr. Judson Uhl: Why is it always, always so costly for Man to move from the present to the future?

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Col. Robert Calder: [Seeing the Ymir for the first time] Incredible! The creature has to be taken alive!

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The Ymir roars in the film are variations of elephant roars sped up and modulated in pitches at different rates.
One of the reasons the film takes place in Italy is that Ray Harryhausen always wanted to vacation there but could never afford to go on his own.
Though the creature is referred to as the Ymir in reviews and websites, the name is never mentioned in the movie. Ray Harryhausen was concerned that audiences would mistake it for the Arabic title "Emir".
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