This is a little confusing, is the AI scientist an AI himself? That seems weird. Or is he a scientist who programs AI's?
Also, you say 'an' AI scientist, then later you say 'their', which is plural, so is there more than one scientist or are you simply using a genderless pronoun? it's confusing.
I'm going to try to decipher this and come up with a logline, but I will probably be a little off:
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"When the AI he created attempts to destroy the world, a programmer must reason with artificial brain by arguing the good of humanity, in hopes of stopping its genocidal plans."