Early Samuel L. Jackson, 1994. I saw it when I was about the same age as the kid, and it stuck with me.
Surprisingly, Rokk's "costume" here actually had a lot of pockets. Just think about the tan lines, though.
I love these hand-drawn holovids you have in this century - cosmic books, I think they're called? Man, even I look good when George Perez is drawing me!
You know, Clark and Kara get all the credit for inspiring the legion (sometimes Lar, too), but you know what it really was? Rokk dug up an old Fiona Apple album and we all immediately realized that this universe is worth fighting for.
An event more than a crossover, but this was the first series I remember reading, and I think it still holds up.