Stan Lee, the man who co-created Marvel Comics, passed away this morning at the age of 95.

Lee started Marvel with Jack Kirby in 1961 with The Fantastic Four. He went on to create Spider-Man, Black Panther, The Incredible Hulk, X-Men, Iron Man and The Avengers.

Stan made cameo appearances in all of the Marvel movies.

Lee had a rocky relationship with Marvel once the company went full-tilt Hollywood. He sued the company in 2002 for royalties he said he was owed for the first “Spider-Man” movie. Three years later he settled the case for $10 million.

“Spider-Man: Into The Spider-Verse” is the latest installment of the film’s franchise and will be released next month.