Boukensha-tachi: Gamba to 7-hiki no Nakama

A movie version of Gamba no Bouken, covering the main events of the series in 90 minutes.
An adventurous wild mouse called Gamba travels with his friends to see the ocean but he finds an injured mouse and hears about the violence of white ferret Noroi. Gamba decides to help the mice suffering under Noroi's tyranny.