In The Quest for the Holy Quail, Geoffrey instructed Merle to kill Queen Griddle when King Allfire wouldn't read the ransom note, and so she tried to feed her to Yugmort the Many-Fanged. When this failed, Merle teleported back to Castle Threadbare with Geoffrey and the Evil Knights. In Newt for a Day, the Hag of Giss is revealed to be Merle's sister. In Sir Hare, Merle was assigned to create a giant knight for fighting the dragon knights, however, the knight turned out to be a giant rabbit.