Certified Graded Keys

Black Knight joins the Avengers; 1st appearance of the Invaders: Captain America, Human Torch, and Sub-Mariner

Neal Adams Cover; Last 15 cent issue

First silver-age appearance of Harvey Dent as Two-Face

Neal Adams cover

2nd appearance of Batgirl (Barbara Gordon)

New look for Batmobile based on TV show

6th appearance of Batgirl (Barbara Gordon)

1st Appearance League of Assassins; Neal Adams cover art

First Doctor Strange cross-over

Sub-Mariner appearance, Doctor Doom cameo.

Cameo appearance of Wolverine; First appearance of Crackajack Jackson; Death of Crackajack Jackson;

First appearance of Hammer; First appearance of Anvil

Origin and 1st Appearance of Guardians of the Galaxy

1st appearance of Volcana

Origin of the alien symbiote that eventually becomes Venom

1st appearance of White Tiger (in standard comics)

1st X-Men crossover

Tales of the Watcher stories begin

First appearance of Lucifer; First Avengers crossover in X-Men title