We never saw a sequel to E.T.: The Extraterrestrial, although that doesn’t mean Steven Spielberg never thought about it. His 1982 treatment for the E.T. sequel would have brought evil aliens into the mix.
In 1982, Spielberg and E.T. writer Melissa Mathison wrote a nine-page treatment ofE.T. II: Nocturnal Fears, which is available online. Set a few months after the events of the original movie, the sequel would have followed Elliott, Gertie, and Michael, who formed an intense bond as a result of their experiences with E.T., but have become obsessed with the idea that their alien pal might return. Dr. Keys, the government agent from the original film, is dating their mom and, influenced by E.T.’s goodness, has decided to pursue a career in medicine. However, the next aliens to land on Earth aren’t E.T.’s benevolent folk, but their mutant enemies:
The aliens onboard are EVIL. They have landed on Earth in response to distress signals designating its present coordinates. These aliens are searching for a stranded extraterrestrial named Zrek, who is sending a call for ‘Help.’
The evil creatures are carnivorous. Their leader, Korel, commands his crew to disperse into the forest to acquire food. As the squat aliens leave the gangplank, each one emits a hypnotic hum which has a paralyzing effect on the surrounding wildlife. These creatures are an albino fraction (mutation) of the same civilization E.T. belongs to. The two separate groups have been at war for decades!