Each day in June you'll get an entry showing you the first appearance of seemingly minor characters, phrases, objects or events that later became notable parts of comic book lore. Not major stuff like "the first appearance of Superman," but rather, "the first time someone said, 'Avengers Assemble!'" or "the first appearance of Batman's giant penny" or "the first appearance of Alfred Pennyworth" or "the first time Spider-Man's face was shown half-Spidey/half-Peter." Stuff like that. Here is an archive of what I've featured so far.
Today is a special Green Lantern edition!
First Appearance of the Guardians
The Guardians show up in the first issue of Green Lantern in 1960.
They are basically there so we can recap Green Lantern's origin from Showcase #22. They, naturally, end up approving Hal.
First Appearance of Kilowog
Kilowog showed up in the first issue of Green Lantern Corps (1986's #201), as he answered the call to arms...
First Appearance of Ganthet
Amazingly enough, Ganthet, who has become "the" Guardian, made his debut less than 20 years ago in the original graphic novel, Ganthet's Tale, by Larry Niven and John Byrne. It came out in 1992. Isn't it weird to think of Ganthet being that "new" of a character?
Feel free to send in ideas for future debuts I should feature here to email@example.com!