"Catnapped! The Movie" centers on a young boy named Takashi and his sister Miko, who discover that their beloved cat, Tora, has been kidnapped by a group of anthropomorphic cats from a parallel world called Mew. Determined to rescue Tora, the siblings venture into this strange realm, where they encounter a society of cats divided into two factions: the peaceful Mew Mew tribe and the aggressive Nyandam Empire. The Nyandam Empire seeks to conquer Mew Mew and harness the power of the "Golden Cat Statue," a legendary artifact capable of granting immense power.

Takashi and Miko ally with the Mew Mew tribe, led by the brave cat warrior Meowrice, and a quirky inventor cat named Catty. Together, they embark on a journey to retrieve the Golden Cat Statue before the Nyandam Empire can use it to dominate both Mew and the human world. Along the way, the siblings face numerous challenges, including navigating treacherous landscapes, solving puzzles, and confronting the Nyandam Empire's formidable forces. The story explores themes of courage, teamwork, and the bond between humans and animals, as Takashi and Miko learn to rely on their wits and the help of their new feline friends.

The narrative builds toward a climactic showdown between the Mew Mew tribe and the Nyandam Empire, with the fate of both worlds hanging in the balance. The resolution hinges on the siblings' ability to outsmart their adversaries and restore harmony to Mew, all while ensuring Tora's safe return. The film blends adventure, humor, and fantasy, creating a whimsical yet engaging tale that appeals to a younger audience while maintaining a sense of urgency and stakes throughout the story.