Flint Lockwood thinks he's a genius. But none of the things he invented are things that make sense or are useful. However, he has the support of his mother but when she dies, he's left alone with his father who thinks he should give it up. When the community that he lives in is in an economic crisis because their primary source of income, a sardine cannery, was shut down, Flint decides to try his latest invention, a machine that can turn water into food. But something goes wrong and the machine ends up in the atmosphere. Later it starts raining food. The shifty mayor tries to use this as a way to help their community, but when Flint senses something wrong with the machine, the mayor convinces him to ignore it. However, as Flint predicts, chaos ensues.

Deep in the endless tunnels of a subterranean cave, an ancient species lies patiently in waiting for the creatures of the surface to step out of the sun in director Richard Pepin's horrific voyage into the black pit of the unknown. Rumor has it that a vast treasure lies hidden deep within an abandoned mine that sits just atop the vast system of caves, and a group of brave adventures are determined to claim the mythical prize for themselves, if it does in fact exist. But something far more sinister awaits the unsuspecting treasure hunters beneath the surface, and as their harrowing journey takes an unexpectedly terrifying turn, they soon discover that humankind is no longer at the top of the food chain.