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Who is your protagonist? What's their goal? Who is your antagonist? What is the story? I should get a clue as to what the story is about from the logline.
Also Antecedents - don't think it means what you think it means.
It has various definitions, as a noun i.e. how you used it can mean a preceding circumstance, event, style or phenomenon.
Can also mean ancestors but if I replace that in to your logline then it's: "Ancestors unwittingly create mankind's deadliest enemy" - it doesn't work. If they are our ancestors, then where is this deadly enemy? ?If they are our ancestors then surely this has all played out, then there is no threat and its not "mankind's deadliest enemy".
There is no story. There is no protagonist racing against time to save everyone.