T-Rex: One day Batman was like, man, I keep running in circles with these stupid criminals I fight. I need to fight SMARTER, not harder!
T-Rex: And he realized the way Poison Ivy got plants to do things for her was pretty smart!!
T-Rex: So he duplicated her chemicals and then he could control plants too, and he also got her immunity to all toxins and poisons which was also great. Plant Batman was even more effective at stopping crimes than Regular Batman! Even Alfred was like "Dang, plants would help me be a better butler" and became Plant Alfred, using plants to deliver snacks to Batman in the field.
T-Rex: Plant Batman saw how effective Plant Alfred was and open-sourced his chemicals!
Utahraptor: Soon all of Gotham could control plants!
T-Rex: Plants were soon used to do dangerous industrial work, and farming was now trivial. As plants had become a source of free, sustainable, and ethical labour, they allowed Gotham to enter a sustained period of universal post-scarcity prosperity. Crime was now fought by removing its economic triggers, thanks to plants.
T-Rex: And while Earth life - animal AND plant-based - spread out amongst the stars, they never forgot the names of "Poison Ivy" and "Batman". THE END.
T-Rex: P.S.: Superman was like "dang I mostly just punched guys; this works way better, wow"