In the distant future, Grunion has returned to get Revenge on Mr. Peabody and Sherman, by erasing all of time. Now the universe is in trouble and it's up to Sherman, Penny, Mr. Peabody, and crew to save the universe. But will they be successful as Sherman and Penny's friendship is also in jeopardy? Will the universe be saved or will the cracks expand and erase everything... forever