PETS UNITED follows a group of spoilt pets, led by glamour pussy cat BELLE, who are stranded in their luxury hangout 'Pampered Pets,' when the machines that run ROBO CITY, the hypermodern metropolis that they live in, go wild and take over, forcing all humans to flee for their lives. Only as a team of pets, will they be able to survive and save their homes, their city and maybe even the world.