Crayon Shin-chan: Blitzkrieg! Pig's Hoof's Secret Mission

The Nohara family and "Onsen G-Men", the secret government agency maintaining all the hot springs in Japan, fight against "Yuzame", a bath-hating terrorist organization plotting to wipe out all the hot springs in Japan.

A comical fantasy adventure on a fight against invaders from another world. The ruler of dark world "Don Kurai," Dark, plots to dominate the human world. There is a legend about three treasures and a hero in Don Kurai, and Dark takes over one of the three treasures, a bell of copper, but a man sent other two treasures (a spear of gold and a shield of silver) to the human world. Shinnosuke falls into Dark's trap and opens the door between the human world and Don Kurai, but he becomes the hero selected by the spear of gold. With the power of a girl from Don Kurai, Mata Tami, the Nohara Family transform into various things and fight against Dark.

A member of the Time Patrol finds out that there is a disturbance in Japan, 1570. While heading to that particular time and location to investigate, she is attacked and ends up stuck underground the Nohara residence at the end of the 20th century Japan. Having limited resources at hand, she is forced to ask for the help of the Nohara family. Together they go back in time and meet with a samurai named Fubuki-maru who believes that they are the legendary three persons and dog whom someone from her family would eventually meet in a crucial moment. The lonely samurai asks for their assistance in defeating the man that possesses strange magical powers, the sinister Unkokusai lord.

By finding a rare Action Kamen card, Shinnosuke Nohara and his family end up being chosen to go to a parallel world and help foil an alien invasion that is occurring over there.