This was the huge event from Superboy & LSH v. 1 #200:
It wasn't so much that two Legionnaires were getting married for the first time. People just had to see a hottie marrying a non-wealthy fat guy to believe it. I recognize it because "hottie marrying a non-wealthy fat guy" was the theme of my own wedding.
Although it wasn't his first appearance, Wildfire joined in Superboy & LSH v.1 #201:
Which is cool because Wildfire was cool for a long time.
But the real reason that issue was worth two thin dimes was that it contained the very first appearance of Infectious Lass:
No one can deny that this is the greatest character of all time. How can she not have her own title and a major motion picture in the works?
Superboy & LSH was also quite the trailblazer back in the day. In v.1 #203, longtime member Invisible Kid was killed off:
These days, that sort of thing wouldn't happen without a major summer crossover event after 52 weeks of build-up. Invisible Kid wasn't a particularly powerful or important cast member, but he was given an amazing send-off.
And he remained dead until the reboot decades later, which is as it should be. I loved Ted Kord and Ronnie Raymond, but dead should mean "gone forever," even in comics.
But we can't leave on a sad note, can we? Of course we can't! Let's have more fun with out-of-context dialogue. From X-Men v.1 #39:
Yeah, friction is awesome. Let's hear it for friction!
See you tomorrow!