Marvel Essential: Iron Man #4

Plot

The quintessential cosmic saga of the seventies begins here! Part Four of Iron Man's Essential Adventuredom shakes the Marvel Universe with the debut of Drax the Destroyer and his Eternal enemy, Thanos of Titan - with Iron Man in the middle! As if that isn't enough, Mister Kline's drawing Tony Stark into another crisis, while the Black Lama's waiting to start a third! Plus: the Mandarin, the Masked Marauder, Mikas and more menaces! Guest-starring Doctor Strange, the Sub-Mariner and the Avengers!

Collecting IRON MAN (1968) #39-61.