Franz Gruber (Baron Zemo, Marvel)
Franz Gruber (Baron Zemo, Marvel) appears in 3 issues in grailworth's catalog, and was first published in 1964. First appearance (unnamed): Avengers #6 (1963), cover dated 1964.
First appearance
Every appearance we value
Avengers (1963) 2 issues
Tales of Suspense (1959) 1 issue
Character appearances from the Grand Comics Database, CC BY-SA 4.0.