Dreadlox,
It sounds to me like your TITANS poster is from a UK reprint magazine.
If I'm not mistaken, TITANS was the title for one of the Marvel reprint comics in England.
They frequently included free stuff like posters, stickers and stuff in their comics.
Normally, you'd find the comics these days without the freebies, but sometimes, a collector would keep them intact and you may find them together on eBay).
If your poster has any info on the back, which could be an issue number or a date, it would help you locate more info.
Good luck.
~P~
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While not the all-time "best" thing in my collection, it IS special because it's one of the few items that features both; Dr Strange AND Man-Thing (my two big faves).
You are correct, however.
Every character, no matter if "A-list" or "D-list" is drawn dynamically by the late, great John Buscema.
PTOR