"How Would We Respond to an Alien Invasion?"

“How Would We Respond to an Alien Invasion?” from Strange Mysteries.goes like this, with some amount of prescience.

The video gives a dark future for us at first:  conscription and the imposition of martial law, under world government. Everything might go on a wartime footing, like before WWII.  The film even has a map showing which countries have conscription now. But the aliens might be here to do us good.

There is a bonus (paywall):
"“What Happens when we Find Alien Life?"
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Another video
“Could Human Beings Be Living on Other Planets Right Now?” (link)  looks at panspermia and examines the theories of Conway Morris, who predicts most intelligent beings capable of a modern civilization might look like us – maybe more limbs.   Convergent evolution has produced the eye many times.