Agent X-13
Agent X-13 (Marvel Golden Age, Operation Rebirth, Elizabeth Ross) appears in 3 issues in grailworth's catalog, and was first published in 1941. First appearance: Captain America Comics #1 (1941), cover dated 1941.
First appearance
Every appearance we value
Captain America Comics (1941) 1 issue
Marvel Comics (2019) 1 issue
Character appearances from the Grand Comics Database, CC BY-SA 4.0.