In a peculiar and charming city, a small and somewhat clumsy scientist becomes obsessed with uncovering the secret of transformation. Torn between his love for science and a secret force that drives him to experiment with his own nature, Dr. Jekyll plunges into a world of madness and adventure. One day, while working in his laboratory, he accidentally creates a formula that not only changes his personality but also transforms him into a small and ingenious mouse.
Now, transformed into an agile rodent, Jekyll must face the challenges of the world from a completely new perspective. What begins as a comedic mischief soon turns into a race to undo his experience before it becomes permanent. As he struggles to keep his humanity intact, he encounters a variety of eccentric characters, including a clever cat that closely pursues him and a group of funny and somewhat quirky animals that assist him on his odyssey.
With a backdrop rich in lessons about the duality of human nature and the struggle between good and evil, this animated fable is filled with hilarious misunderstandings and unexpected twists. As time goes on, Jekyll must decide whether to embrace his new life as a mouse or find a way to regain his human form, leading us to a delightful conclusion that will leave the audience with a smile.