The sound of E.T. walking was made by someone squishing her hands in jelly.

The concept for E.T. was based on an imaginary friend Spielberg created after his parents’ divorce in 1960. In 1980, Spielberg met Mathison and developed a new story from the stalled science fiction/horror film project Night Skies. The film was shot from September to December 1981 in California on a budget of US$10.5 million. Unlike most motion pictures, the film was shot in roughly chronological order, to facilitate convincing emotional performances from the young cast.

Released by Universal Pictures, E.T. was a blockbuster, surpassing Star Wars to become the highest-grossing film of all time—a record it held for ten years until Jurassic Park, another Spielberg-directed film, surpassed it in 1993. Critics acclaimed it as a timeless story of friendship, and it ranks as the greatest science fiction film ever made in a Rotten Tomatoes survey. The film was re-released in 1985, and then again in 2002 to celebrate the film’s 20th anniversary, with altered shots and additional scenes.