This was a six mini-series by Marvel written by Jim Starlin, penciled by George Perez and inked by Ron Lim. Basically, Mistress Death is upset that the balance between life and death has not been in her favor. She then gives her ardent follower, Thanos a chance at rebirth.
Thus setting him forth with a mission of killing half of the universe. Despite his powers, Thanos realizes his mission is near impossible. However, he then remembered the Infinity Gems were contributory to his death. Thanos then peers into the Infinity Well to discover their secrets.
He defines the true nature of the gems and their current owners.
This is a limited five (six) issue limited comic series that began in 2013. It was written by Jason Aaron with art by Simone Bianchi. It is essentially an origin story for Thanos.
Without plundering what this limited series is about — I will tell you this is prime to understanding Thanos before Infinity War adapts his origin into the film. If you want to know more about Thanos and who he is as a character, check out Thanos Rising!
Infinity is a crossover storyline in 2013 by Marvel. It was written by Jonathan Hickman with art by a few artists: Jim Cheung, Jerome Opeña, and Dustin Weaver. These set of issues include a threat to the universe by an ancient race called, ‘The Builders.’
The second is the mysterious ailment plaguing the universe with Earth at the center. And, the third issue is political ramifications of these said events have on Earth’s relationship with the rest of the galactic community.
An eighteen issue Captain America story arc. Published by Marvel Comics; Ed Brubaker with writing and with art Steve Epting. In the aftermath of Civil War, Captain America is taken into S.H.I.E.L.D. custody. There he remains assassinated by Red Skull.
Crossbones snipes him while Sharon Carter (Agent 13), who was brainwashed at the time, was posing as a S.H.I.E.L.D. psychiatrist delivers the shot. This leaves everyone with hurt, pain, and rage as they take on to find who killed Captain America. This is the arc where Bucky Barnes becomes Captain America.
Which is what might happen in the actual MCU soon…
The Infinity War remains a six-part comic series under Marvel comics written by Jim Starlin and penciled by Ron Lim, Ian Laughlin, Al Milgrom, Jack Morelli and Christie Scheele. This comic and storyline is a direct sequel to the 1991 Infinity Gauntlet comic we mentioned above.
The Magus develops a plan to gain absolute power, as they all do, over the Marvel Universe. He acquires “cosmic containment units,” which are items similar to the Cosmic Cube. Magus also acquires demonic doppelgangers of Earth’s heroes and villains.
Without spoiling any of these and this one included, we will only tell you this is one of the most important comics on the list to read before the film. Not only does it have the same name as the film, it will lead to some interesting revelations.