There's no way you missed the news that Stan "The Man" Lee died today at 95 years old.
We're all very saddened by this, but choose to remember him by his work. So here, from Captain America Comics #3, is Stan's first published work for Marvel (then known as Timely Comics), "Captain America Foils the Traitor's Revenge":
Now, a bonus: for the Marvel 75th Anniversary Celebration comic, editor Tom Brevoort had Stan adapt that first story for an actual comic, drawn by Bruce Timm:
That turned out to be the last writing work Stan did for the company.
If you count villains and named supporting castmembers, Stan Lee created 1,225 characters for Marvel, but his first Marvel story was also his final Marvel story. That's a bit poetic, and pretty much perfect. Excelsior!