A story about a boy who shelters a lost and homesick alien and grows to befriend and love him. The boys love for the alien creates a bond between the two that is so strong that they share each other's emotional and physical states. This is hilarious when in one scene the alien gets drunk while left home alone whilst the boy, Eliot, goes to school. The aliens drunkenness results in Eliot liberating a classroom full of deathrow amphibians and passionately kissing the girl he admires, while the alien watches soppy movies and eats junk food.
However things go awry when the alien's homesickness manifests as an ailment that begins to kill him and his now symbiotic human host too. Throw into the mix the further complicating factor of the government wanting to capture the alien and what started as a moving account of friendship turns into a race against the authorities and time to return the alien to his ship and safe from the clutches of the government.
With great comic moments and touchingly sweet displays of affection from a young and believable cast and a very convincing alien creature, this film is an enduring classic.