Stan Lee says he has 'no idea' who Ultron is.
We are going to be introduced to the character of Ultron for the first time when Avengers: Age of Ultron is released next summer.
And while Lee created many of Marvel's iconic comic book characters, Ultron is one who is unknown to him.
Speaking to Playboy, Lee said: "I don't have any idea who the hell Ultron is.
"He was a character developed after I stopped being involved in the Avengers story."
Avengers: Age of Ultron will be the second Avengers movie, and will bring Phase Two of Marvel films to a close next May.
As for Lee, he will be making a cameo appearance in Captain America: The Winter Solider, when it is released next week.
Can you spot Stan Lee? The comic book writer has turned up in nearly all of the Marvel films in recent years.
Filming on Avengers: Age of Ultron is currently underway.
Avengers: Age of Ultron is released 1st May.