Stan Lee’s scheduled appearance at the 2014 San Diego Comic-Con was canceled abruptly after he lost his voice.
Lee, 91, is the co-creator of Spider-Man, Hulk, Avengers, and X-Men.
Several of his movie and television versions of his creations are being promoted at Comic-Con.
Lee was scheduled to make appearances and sign autographs on Friday and Saturday.
“Unfortunately Stan Lee has lost his voice due to laryngitis and is unable to attend this year’s San Diego Comic-Con, and has regrettably had to cancel his appearances,” said his spokesperson to THR.
“Stan is otherwise well and in good health, though he is disappointed to miss the event and wishes everyone a great time.”
Lee typically attends the convention for multiple days.
He’s due to appear at other conventions later this year, and has already appeared at several, such as the Phoenix Comic-Con last month.