I'm not going to go in depth but its not an origin story and as far as I know its not based off of any comics. Basically Brainiac is the villain but hes like a program rather than a kryptonian android. The program was a chip that was found in the kryptonian ship wreckage and Lex Luthor steals it from the kents. Also Lex is an Elon Musk allegory and he has a company called Spacelex. I want Lex and Brainiac to have arguments inside of his brain and they argue because brainiac wants to destroy the world and Lex believes he is the savior of humanity and the whole reason he founded Spacelex is to take humanity to the largest moon of Saturn, Titan. Brainiac takes over Lex's body and shaves his head so he can plug those cord things from the comics in (we needed a reason to have Lex shave his head and for brainiac to have those things on his head.) In the final battle Brainiac is going to destroy the planet if Superman doesn't stop him but Clark doesn't want to kill Lex which he could do with a single punch so he has to talk to Lex and tell him to reject Brainiac from his mind and in the end Lex saves the world and Clark doesn't kill anybody. Clark is also working at the daily planet throughout this movie and after beating Brainiac he finally asks Lois out, not as Superman but as Clark.
