Mice of NIMH

The Mice of NIMH, referred to in-universe as G group, were a group of eight mice in Mrs. Frisby and the Rats of NIMH.

History
The mice were part of a side experiment performed by NIMH scientist Dr. Schultz, in which he gave them the same injections given to the Rats of NIMH. As a result, they made similar gains in intelligence, including the ability to read, and gained an extended lifespan. Unlike the rats, they were unable to escape from their cages unaided, as their smaller size prevented them from reaching the latches. As such, when they overheard the rats planning their own escape, they appealed to them to help them do so as well.

With some reluctance, the rats agreed, and the two groups sets out together into the air vents of the NIMH facility where they had been held for a number of years. Unfortunately, while they were escaping the air conditioning increased in strength, and six of the mice were swept away into the vents. Only two, Jonathan Frisby and Mr. Ages, went saved by the actions of the rats, who persuaded them not to look for their comrades for fear of being lost with them. The other six were never heard from again, leaving their companions and the rats uncertain as to what had eventually become of them.

Jonathan and Mr. Ages would accompany the rats until they reached the Fitzgibbons' farm, at which point they took up a separate abode. Jonathan later met and married Mrs. Frisby, and they had four children together: Martin, Teresa, Timothy, and Cynthia. The four inherited Jonathan's enhanced intellect, but it is unknown whether they also gained his greater longevity.

Depiction in film
The role of the mice in The Secret of NIMH is virtually identical to that they played in the novel. However, The Secret of NIMH 2: Timmy to the Rescue revisited the concept of the six mice who were lost during the escape from NIMH. At least two, a couple by the names of Helen and Troy, are revealed to have survived getting lost in the vents. By the time of the film they have an adult daughter, Jenny, who like the Brisby children has inherited their enhanced attributes.

Members

 * Jonathan Frisby
 * Martin Frisby
 * Teresa Frisby
 * Timothy Frisby
 * Cynthia Frisby
 * Mr. Ages
 * Helen (film only)
 * Troy (film only)
 * Jenny (film only)