"Clementine is different from other mice: she can calculate the speed of light and she dreams in Latin. The scientists say she's a genius and put her through test after test. Clementine is proud of being a good lab mouse, but she's lonely. Her only snatches of friendship occur during her late-night visits with a chimpanzee named Rosie. When a compassionate lab technician frees Clementine, the mouse discovers an outside world full of wonders: Brussels...

Secretly rescuing a stray cat while helping Danny make a horror film, Mellie becomes the recipient of the cat's gifts of headless birds and mice, while Danny harbors growing suspicions that the cat is actually a zombie.