You could unironically clean up Batman and Robin into something far more interesting today.

Imagine Mr. Freeze as somebody who masquerades as a Silicon Valley Tech billionaire, even going toe-to-toe with Bruce Wayne, but is secretly funding massive global cooling geoengineering including eco-terrorism for re-wilding and carbon capture. Why does he do all of this? Instead of saving his wife, maybe he wants to guarantee a future for his kids. One of his kids is a gen-z Poison Ivy.