Fantastic Four: World's Greatest Heroes (2006)

S1E18 The Cure

Title: The Remedy Plot: Reed successfully develops a cure for the Thing, but in a twist, it erases all of his memories from the time the Fantastic Four was formed. When the Mole Man launches an assault, She-Hulk steps in for the Thing, leaving the helpless Ben Grimm to devise a plan to turn the tide and save the day.