Elliott, a little boy full of illusions, has an older brother who always wants to play tricks on him and a little sister Gotti who is not very good at talking. The three siblings live with their recently divorced mother. Due to busy work and bad mood, mothers often neglect the care and communication with their children.
A spacecraft visits humans and collects samples of plants on the earth. At this time, the man with a bunch of keys led a group of people to appear, and the alarmed aliens left in a hurry. A little alien ET was accidentally left on the earth by his companions, and was fortunately caught by the kind little Airy. Otter discovered that he secretly kept the lonely and helpless ET without telling his mother, ate it with chocolate, and introduced it to his dog, brother and sister, although ET and Elliott still couldn’t communicate with each other in language. However, their feelings have crossed all external barriers and are linked together. Although their appearances are so different, they all have a kind, sensitive, childlike heart that longs for love and care. Between them, a wonderful telepathy is established. When ET is sad, Elliott will also feel melancholy. When ET is sick, Elliott is also uncomfortable. The lonely ET and the lonely Elliott became best friends, so they were no longer alone.
Until one day, ET was inevitably discovered by the adults, so people were facing the enemy, the police, the army, and the FBI all swarmed in. Regardless of the pleadings of the children, the adults took ET mercilessly, ignoring how innocent, fragile and desperate it was at this time. They just wanted to study this alien as a rare and precious experiment.
With the help of his brother and his friends, Elliott finally rescued the nine-dead ET from the research center. Unexpectedly, the adults did not let them go. Many checkpoints were set up along the way to intercept this "rescue team", just in the adult's eyelids. Underneath, ET showed its incredible magical power, and took everyone out of the "circle of encirclement."
In the woods where ET was first discovered, the alien spacecraft that came to pick up ET came, and ET, who had been thinking about going home, finally left. Elliott and his alien friends reluctantly bid farewell to his alien friends, looking far away. The spaceship that went to cut across the sky with a gorgeous sunset, Elliott knew that he would always remember this short but beautiful friendship forever.
