The rats and mice, made intellectually superior in the original Secret of N.I.M.H., return to Thorn Valley to groom their destined leader - young Timmy Brisby.
- Dom DeLuise
- Andrew Ducote
- Eric Idle
- Harvey Korman
- Peter MacNicol
- William H. Macy
- Andrea Martin
- Arthur Malet
- Ralph Macchio
- Meshach Taylor
- Musician: AL JARREAU
- Producer: Jonathan Dern
- Writer: Sam Graham
- Music Supervisor: Richard Kaufman
- Writer: Chris Hubbell
- Composer: Lee Holdridge
- Songs by: Lee Holdridge
- Editor: Jeffrey Patch
- Producer: Paul Sabella
- Musician: Bobbi Page
- Based on a Work by: Robert C. O'Brien
- Songs by: Richard Sparks
- Director: Dick Sebast
- Executive Producer: William Stuart
- Co-Producer : Robert Winthrop
