Locked in a standoff with Susie over who will say sorry first, Mildred runs away to the woods and befriends a ghost. Will one of the McAllister sisters give in and apologize before the townsfolk run Mildred out of town?

After discovering that young Mortimer doesn't have any friends, Oscar helps him start a new club on campus. But the monsters are forced to hide their newfound friendship from the school – and Stuart.