It is called the Time Travelers Paradox. In which a scientist creates a Time Machine and kills their younger self. So now a man who should not- can not- exist, somehow does. That is the Paradox, and Paradoxes are impossible. And the man who has created it, is Tim Travers. A reclusive mad scientist whose stated mission in life is to stand alone with God at the end of time, and tell the bastard off.
In the course of his adventure, Tim Travers will take on the mercenary gang whose stolen plutonium powers his machine, challenge an Alex Jones-esk podcast er to a battle of wits, create a black hole, meet the one woman alive crazier than him, clone himself, destroy the universe, Make a new one, and maybe- Just Maybe- learn to love himself at last.