Role in the film
After Sherman bites his classmate Penny Peterson for calling him a "dog", Ms. Grunion is determined to have the adoption agency reclaim Sherman from Mr. Peabody. Later on, after she did try to take Sherman away, Mr. Peabody's fatherly instinct got the best of him and decided to bite her arm. Ms. Grunion called the police to have him taken away to the pound while a hole was ripped in the space-time continuum. In the end, she got dragged back in time by King Agamemnon and the giant duo were married, while she became a kinder and happier person.
- Grunion's voice actress Allison Janney also voiced Gladys Sharp, one of the main antagonists in Over the Hedge, another film by DreamWorks Animation.
- She looks as fat and as similar to Ursula from The Little Mermaid and Aunt Pristine Figg from Tom and Jerry: The Movie.
- She has some straight (but almost untrue) similar moves to Agatha Trunchbull from the movie Matilda.