In a single issue, the FF fight briefly with the Kree Supreme Intelligence…
…who is pissed about how the FF dissed The Sentry last issue), and meet Ronan the Accuser, who doesn’t really become a major character until Marvel’s “cosmic” storylines start kicking around the 1970s.
Here’s the team fighting him, all at once.
Creators: Lee, Kirby
First appearance: Ronan the Accuser