This Island Earth (1955)

Sometimes it doesn't even matter whether your planet is the target for the alien invasion.   Interstellar politics being what they are, you're just as likely to get caught in the middle of somebody else's war and you find the Earth being conned into helping the Metaluna war effort.  Okay, the defence contract dollars are pretty good, but the down side comes when the Zahgons incinerate Metaluna and the survivors show up for a bit of resettlement and genocide. 

Here you see one of the mutants that the Metalunans have been breeding for centuries. 

To quote MST3K, "WHY?!?"

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