Amazing Adventures #21 was published by Marvel Comics on November 1, 1973, as part of a series that began in 1970. Don McGregor writes, and art comes from Herb Trimpe and Yolande Pijcke. This 36-page issue features Killraven, M'Shulla, Carmilla Frost, Old Skull and Grok, among 7 characters cataloged on VerseDB.