The first arc of the Aaron era of Avengers really goes into overdrive in issue #5.
Lots of backstory and reveals, lots of large scale action, and some choice character moments.
As the issue's title is "The Secret Origin of the Marvel Universe," you know from the jump that some major sh*t is going down and Aaron and co. deliver.
As we begin, Loki is still holding court in the company of the captive Captain America as they linger in a mystic bubble in the waters of the North Pole, looking upon the carcass of the first Celestial to visit Earth, dubbed The Progenitor by Loki.
As Loki explains, the first Celestial did not come to Earth with a plan to plant the seed of life on this planet. No, instead it fell into the the still-evolving stew of life in the throes of its own gruesome death.
This Celestial had been infected by the cosmic locusts known as the Horde, something it had encountered while traveling in deep space. It fell dying for years before it landed on Earth. Once on Earth, it's sickness bled into the shifting primordial elements of a still-forming planet. It was the blood and rotting flesh of this nigh-omnipotent being working its way into the bubbling creation of a planet that made Earth an unique breeding ground for all the super-powered beings one day to come.
Loki taunts Cap with the knowledge that life on Earth as we know it sprung from a cosmic accident.
But Cap tells Loki that it doesn't matter how life started, only what we do with it. Even though he's chained, he head butts Loki, telling him he'll do whatever it takes to stop him and his Final Host. Loki backs away from Steve and continues his tale.
According to Loki, millions of years after the Progenitor came to Earth to die, another Celestial eventually followed looking for them. This was Zgreb the Aspriant. He was the lover of the previous Celestial, or however it is Celestials describe such things. The sight of its dead lover drove the Celestial mad, or perhaps that was the affect of the Horde latching onto him. In any event, Odin and his Prehistoric Avengers took on this Celestial, leaving it for dead deep in the Earth.
Eventually, the disappearance of two Celestials brought down The First Host to Earth. They made quick work of the Prehistoric Avengers but left after the battle, rather than destroy the Avengers or the Earth. Loki surmises that the Celestials feared succumbing to the Horde themselves and believed it better to leave it contained on, as Loki describes it, this "cosmic leper colony of a world."
That plan seemed to work for some time, until Loki revived Zgreb from his long slumber deep in the Earth. The Horde did not kill Zgreb, now known as Zgreb the Sorrower, instead the Horde transformed him into a new breed of Dark Celestial. Together with the rest of his kind, collectively known as the Final Host, they've killed or infected every other Celestial, the dead bodies of whom now litter the Earth, feeding the Horde.
Unknown to Loki, Ghost Rider has come upon Loki and Cap's location during the course of Loki's speech. GR attacks Loki and frees Cap, stuffing Loki in his trunk.
Running ahead of the Final Host, Cap and GR end up in a snowy village in Russia where Doctor Strange and Iron Man converge on their location. Soon, Black Panther and Captain Marvel and Thor and She-Hulk arrive as well.
All these disparate teams have brought something new to the fight. Tony has summoned an armor dubbed the Godkiller Mark II, T'Challa has used the Alpha Flight labs to infuse Carol's unique physiology and his suit with the same energy as the Horde creatures, making them able to put the bugs down. And Thor and Jen have brought from Old Asgard the Blood of Ymir, a magical weapon that will allow them to be on equal footing with the Celestials.
Cap sees that Robbie feels out of his league and gives him a Cap-style pep talk that Robbie takes to heart, coming across a means to join the battle in earnest.
The issue ends with an epic double spread that shouldn't be spoiled ahead of time but it's a truly cool, kick ass image - the kind of glorious insanity that you only find in comics. All I'll say is that Ghost Rider fans will be especially pleased.
Next issue is the conclusion of this first arc and this issue has definitely whet my appetite for a big finale. Really digging this book.