Iron Man 55 / October 31, 1972
The first comic I cracked out of a CGC case, the seller had to ask why? I am a collector, not an investor.
This issue is packed full of firsts; notable by most would be Thanos. Then there is Drax the Destroyer (who I think looks better green), Star Fox, Mentor, the Blood brothers, and the Roclites.
Art by: Jim Starlin, Joe Sinnott, Gaspar Saladino, and Morrie Kuramoto