A key issue noted for First appearance of Ultron and First full appearance of Ultron. The Avengers #55 was published by Marvel Comics on August 1, 1968, as part of a series that began in 1963. Roy Thomas writes, and art comes from Bob Fujitani, Dick Ayers and George Klein. This 36-page issue features Hawkeye, Hank Pym, Black Panther, Wasp and Jarvis, among 12 characters cataloged on VerseDB.