 First, after Grimm temporarily lost his powers and reverted to human form, Reed Richards hired Luke Cage (then using the code name "Power Man") to take his place until Richards had completed a Thing-suit for Ben (however, Ben unexpectedly reverted into the actual Thing again later on).Years later, after Grimm chose to remain on Battleworld in the aftermath of the "Secret Wars" due to his apparent control over his transformation between his human and mutated states, he asked the She-Hulk to fill in for him, Mister Fantastic did leave him with the device needed to return to Earth when it comes time.Thing's time on Battleworld lasted until Ben eventually deciding to return home after defeating Ultron and slaying his manifested dark side Grimm the Sorcerer.