In an interview for his new book, "Red: My Uncensored Life in Rock" at mtvhive.com, Hagar lets go of what even he admits might make him "sound like a crazy person" to some readers.
He and the reporter are talking about dreams he claims to have had about UFOs, and when asked whether he believed he had been abducted, Hagar answers: "I think I have."
The reporter seemed surprised. "What? Really? I was kidding. You seriously believe that?" he asks.
Hagar laughs and goes on to explain that a passage in the book described as a dream in which he is contacted by aliens from outer space in California was, in fact, reality.
The tale describes how the beings tapped into his mind through a wireless connection.
"It was real," Hagar told the reporter, according to the story on MTV's Hive website. "They were plugged into me. It was a download situation ... Or, they uploaded something from my brain, like an experiment."
Hagar goes on to describe another experience at the age of four where he believes he saw an alien space ship in broad daylight hovering over a country field where his family lived.
The rock guitarist and vocalist is no stranger to wild times. He was a part of several bands, including Montrose, during the "sex, drugs and rock 'n' roll" era of the 1970s and 1980s, and during its heyday Van Halen was among the biggest acts in rock music.
In his book and in the interview with MTV's Hive, Hagar lets the stories fly on the sex and drugs he did during those years, and he even has a few not-so-nice things to say about another Van Halen lead singer, David Lee Roth, whom Hagar replaced in 1985.