They tore themselves out of the sky, the spiders, their silvery-sharp claws reflecting the glare of sunset, and screamed to the Earth in dizzying waves of super-heated steel.
I had built them decades ago – they were supposed to spread across the galaxy, finding life and assessing it, making sure it wasn’t a threat to humanity. Taking care of it if it was.
Of course nobody had believed me; all I ever got was mockery and scorn.
I didn’t bother with press releases when they returned: nobody would listen.
Besides, what would be the point? I’d built them to be unstoppable.
Author’s note: I don’t think it would be any surprise to find out that we’re our own worst enemy.