Fantastic Four #2, page 10, panel 5
Writer: Stan Lee
Artist: Jack Kirby
Uncredited Inker: Sol Brodsky
Uncredited Letterer: Art Simek
The second ever FLAME ON! is our focus today, and the first notable thing about this panel is how similar it is in posing to the first ever one. Johnny is facing the camera, holding up his right hand, and igniting his index finger. The second notable thing is that, once again, his catchphrase is not accompanied by a full body ignition. Based on these first two usages, it would appear that FLAME ON! was initially a method for Johnny to control his flame at a minute level, rather than as a battle cry.
Oh, and the shaggy vagrant about to get a fiery shave? Why, it's Namor, the Sub-Mariner.
Check out our coverage of Fantastic Four #4 in our third episode: Super-Villain Cavalcade