Pluto
Pluto (enemy of Mercury/Hurricane, alias Rudolph Hendler/Paul Sayden/S. Devile) appears in 7 issues in grailworth's catalog, and was first published in 1940. Villain, introduction, alias Rudolph Hendler: Red Raven Comics #1 (1940), cover dated 1940.
First appearance
Every appearance we value
Captain America Comics (1941) 3 issues
Marvel Mystery Comics (1999) 1 issue
Marvel Super-Heroes (1967) 1 issue
Red Raven Comics (1940) 1 issue
Character appearances from the Grand Comics Database, CC BY-SA 4.0.