A fat cat comes to live with a grumpy old man but causes so much destruction the old man throws him out. It doesn't take long for the grumpy old man to realize how much he misses that cat's company.

Cornelius prefers life on the quiet side. He's orderly and neat and doesn't have time for any ruckus. But his meticulous life soon spins into utter chaos when a suspicious package appears on his doorstop and out pops a wild and crazy fat cat! This fat cat is stinky, mischievous, messy, and loud! With every new and not-so-fun adventure, Cornelius's patience begins to fray. Will the cat have enough convincing power to win over the heart of Cornelius, or will he need to look elsewhere for a forever home?