The Entropy of Everything: The Indestructibles Book 3;

Time travel is a long-standing tradition among superheroes, and so when Anachronism Annie, a friend and ally of Doc Silence, asks the Indestructibles to journey with her to save an alternate future where everything has gone terribly wrong, the team agrees. In this other timeline, a few small decisions have led to a much darker and more tragic world, and the adult versions of themselves the Indestructibles meet—Solar, the Dancer, Straylight, Whispering, and Entropy Emily—are nothing like they expected. Are they heroes? Martyrs? Or perhaps even villains? And what happens when the young Indestructibles discover that the alternate future’s version of one of their own team has been turned into the very weapon that will be used to destroy the whole world? Can they team up with these darker versions of themselves to save an entire future? It's said that when you time travel, you can never come back the same. How will journeying through time change the Indestructibles? Will they ever be the same? The Entropy of Everything is the third book in the Indestructibles series.