Books in the Teenage Mutant Ninja Turtles series

The dull-witted Bebop and Rocksteady are feeling dejected and without purpose after their defeat to the Turtles. However, when they stumble across a time-travel scepter, they realize that their craziest, most destructive adventure awaits! Will the universe survive?

Time is short as Krang accelerates his plan to terraform the Earth… which will kill all who live on it! A surprise alliance results in a daring plan - and the stakes have never been higher! Collects issues #41-44.