In the bustling and hectic world of London, a stylish house mouse named Roddy lives a life of comfort and luxury. However, his existence takes an unexpected turn when his home becomes the target of an intruder: a noisy and careless rat named Sid. After a small confrontation, Roddy is dragged into the city's sewers, where he ventures into a peculiar and vibrant underground world.
Desperate to return to his former life, Roddy encounters Rita, a bold and savvy rat who navigates the dangerous waters of the underworld when she’s not busy running her "taxi" business in a small boat. Together, they form an unlikely alliance, facing the challenges of the big city, including a rather peculiar villain: a toad with a personal vendetta seeking to capture Roddy for his nefarious plans.
As the two characters embark on an exciting adventure filled with humor, action, and a touch of romance, Roddy begins to appreciate the simple things in life and what it truly means to be part of a family. His quest to return to the heights becomes a journey that will change him forever, teaching him to value friendship, authenticity, and the thrill of living without fear. Will Roddy and Rita be able to overcome all obstacles and escape the clutches of the villain? The answer will lead them to an unexpected conclusion on this underground journey!