Gretchen Gritcherson aka "The Gretch" is a girl who is described as being anything but "sugary sweet", as she is sardonic and indifferent about everything. Her lack of enthusiasm is made up with her sharp, critical tongue. With a black belt in karate and an intolerance toward wrong doing, Gretchen is not a girl you want to mess with. However, underneath the tough exterior, she has a huge heart and secretly wishes she could be like any normal girl (though she would never ever reveal this).
Her catchphrase is "Ya think?!" usually said to McGee when a plan has gone wrong and he points out the obvious. She is revealed to have a severe phobia of chipmunks in "Cheeks of Dread" and is allergic to lizards and dragons, shown in "How to Potty Train your Dragon."