Chapter 3:
It was a mistake Lex regretted. With a little bit of kryptonite, Superman, or rather Clark Kent of Smallville, was simple to kill. All Lex had to do was find him, which was also a simple task, seeing as Superman gave off a unique power signature, child and adult alike. It baffled Lex that Superman, the all-powerful defender of Metropolis was actually Clark Kent, the meek and clumsy reporter that gave Lois looks of undeniable passion when she wasn't looking. It made sense, though. How was it possible that Superman always knew when Lois was in trouble? It was elementary: he never left her side.
Lex had succeeded in his task, but when he went back to the "present" time, something had gone wrong. Brainiac had taken over, and the entire planet was nothing but a slave house, all sentient beings bowing to a computer. When Brainiac had landed on Earth, there was nobody there to stop him, so he, and the Legion of Doom he had established, took over. There was another Lex there too, one that served the machine and was ranked higher than any other members of the Legion of Doom. It wasn't a bad existence for this Lex, as he had all the power and none of the responsibility, but this was a problem for our Lex.
Hiding from the scanning mechanisms and managing to go underground, Lex found that the more time he spent in this dimension, the worse the condition of his travel device became. He needed to stop himself from going back in time in the first place, but the travel device was draining him of his strength. Desperately and frantically, Lex typed a command into the matrix on his wrist and whispered a short prayer to a God he didn't believe in before being whisked away again, leaving nothing but a flicker of green light.
Lex went to another dimension, one without Brainiac and all of the chaos he had created, hopefully one with Superman, so he could bring the Man of Steel back with him to stop himself. It didn't work exactly the way he had planned it. Instead of teleporting to Metropolis and taking a probably reluctant caped hero to the almost-beginning, he wound up in a strange and totally different place. Instead of someone with the brains of a boy scout and the brawn of a dying star, he got a mentally unstable, rude, and immature man that called himself "Deadpool".