I was reading a wikipedia entry on Infinity, Inc., when I stumbled across this bizarre reference:
"Just in case you feel like a ride on a cat-cycle... the lady's name is La Garro!"
La Garro never appeared in DC comics, but her design is similar to Wildcat II, aka Yolanda Montez. Instead, they included Star-Spangled Kid on the team, in fact making him the leader of Infinity, Inc.
What other characters have appeared in promo materials but never actually got into comics?