Leonard McKenzie (Marvel, Sub-Mariner's father)
Leonard McKenzie (Marvel, Sub-Mariner's father) appears in 7 issues in grailworth's catalog, and was first published in 1939. First appearance (in narration flashback to 1920 only): Motion Picture Funnies Weekly #1 (1939), cover dated 1939.
First appearance
Every appearance we value
Avengers (1963) 1 issue
Fantastic Four (1961) 2 issues
Namor, the Sub-Mariner (1990) 1 issue
Character appearances from the Grand Comics Database, CC BY-SA 4.0.