WALL-E (Waste Allocation Load Lifter – Earth Class) does the job he was built for – collecting trash, crushing it and piling it up one block at a time. Except that he is doing it 700 years after humankind left earth. Someone just forgot to turn this robot off.
Over 7 centuries, WALL-E develops an almost human personality. He watches old TV shows and collects interesting items he finds, including a plant, in his red cooler and organizes these treasures in a truck. He is lonely with only a pet cockroach for company
Humankind left earth when it becomes too toxic and now lives on the spaceship Axiom. They are waiting for the day when they can return home. But over the centuries, everything is so automated and run by robots on Axiom that humans have become obese and have even stopped thinking.
Enter EVE (Extra Terrestrial Vegetation Evaluator). She is a state-of-the-art, sleek robot, who can fly and is armed with a laser gun. She is a probe with a classified directive - to find signs of life. The Axiom routinely sends out these probes which usually return negative.
EVE lands on Earth and meets WALL-E. WALL-E is fascinated by EVE and develops a real liking for her. But as soon as EVE sees the plant, her mission directive takes over - she shuts down and sets off to take the specimen back to the Axiom. A distressed WALL-E follows her across the galaxy back to the spaceship.
Every movie has a bad guy - Auto (Auto-Pilot) has been running and controlling the ship and he likes this status quo. So he tries to destroy this evidence of life which will lead the humans back to Earth. It is up to WALL-E, EVE and a bunch of misfit robots to save the day. The humans too have to snap out of their mechanized stupor and learn to rediscover Earth.