姆咪谷附近的火山爆发,引起了大洪水。姆咪谷给淹了,姆咪家也没了顶,一家人转移到从水上漂来的一座大房子里。后来才弄清楚,这其实是个戏院。姆咪爸爸干脆编写剧本在河上演出。与此同时,被洪水冲散的姆咪特罗尔、小咪咪他们也各自经历了许多危险。最后大水退走,全家团圆。 A volcano erupted near the Mimi valley, causing a flood. Mimi Valley to flooded, Mimi home also did not top, the family moved to a big house floated from the water. Later it was clear that this is actually a theater. Mimi Dad simply wrote the script to perform on the river. At the same time, Mimotorr, who was washed away by the floodwaters, has also experienced many dangers each. The last flood receded, the whole family reunion.