Mordred
Mordred (Marvel) appears in 20 issues in grailworth's catalog, and was first published in 1955. First appearance (also in flashback): Marvel Chillers #1 (1975), cover dated 1975. Key issues with Mordred include Marvel Super-Heroes #12 (1967).
First appearance
Key issues
Origin
Every appearance we value
Avengers (1998) 4 issues
Black Knight (1955) 1 issue
The Defenders (1972) 1 issue
Marvel Chillers (1975) 1 issue
Uncanny Origins (1996) 1 issue
What If? (1977) 1 issue
Character appearances from the Grand Comics Database, CC BY-SA 4.0.