This pleasantish family animation recounts the tale of a large-eared mouse (voiced by Matthew Broderick) whose fearlessness confounds his family and gets him banished from the murine community, on the grounds that you can't be a proper mouse if you don't scurry and cower.
He fetches up in the darker subterranean Ratworld, which resembles Kurtz's jungle hideout in Apocalypse Now, and stages gladiatorial games where mice are thrown to outsize moggies. A nice touch. Meanwhile there's a princess pining away in the castle upstairs, and a king who mourns the death of his queen following a nasty soup incident. A long story, and one more likely to work its charm on kids than on their parents.