Last issue Super-Skrull abducted Quicksilver and Scarlet Witch and the Kree Captain Marvel in his flying saucer. Captain America, Goliath, Iron Man, Thor and Rick Jones are left with 3 Skrull captives, who had been disguised as cows, and then as the male members of the Fantastic Four.
The Avengers contact the FF, who suggest they have run across the 3 Skrulls the FF hypnotised into thinking they were cows in FF#2. Reed Richards mentions that there was a 4th Skrull unaccounted for.
Meanwhile Vision has flown after the Skrull craft. Phasing inside he finds the Super-Skrull telling Marvel that he is using the mutant twins' special brain-waves to guide the ship to the home of the Inhumans, who have similar brain-waves. This was the only reason he wanted them.
Super-Skrull wants to destroy the Inhumans' city because they are related to the Kree, and Vision tries to stop him. The villain fires his weapon, but the city is suddenly defended by a black force field.
Vision reasons that he can't defeat Super-Skrull, so leaves him to tell the Avengers what is going on. Even though it means the Skrull takes his love Scarlet Witch home to the Andromeda galaxy.
Super-Skrull's saucer has now docked with a larger ship, which goes through a space-time warp instantaneously to the far galaxy. He has been in exile imposed by the Skrull emperor, who feared him as a rival. He hopes to end that exile with the gift of Captain Marvel. But when the royal palace's defences open fire on his ship, Super-Skrull retaliates, and considers making the bid for power that the emperor was worried about. The emperor's daughter Anelle watches her father remote weapons specially designed to capture and subdue his enemy.
The emperor transports Super-Skrull's 3 prisoners to his presence. He recognises Captain Marvel, and hopes to get the secret of the Omni-Wave from him, which Super-Skrull failed to get by subterfuge last issue. The Omni-Wave facilitates instantaneous communication, even between galaxies. But it can also be used to send a ray-beam to the heart of the enemy.
The Convention of Fornax prevents the emperor torturing the information out of the Kree Mar-Vell. But it doesn't apply to Earthlings. He transports Wanda and Pietro into an arena where they face a savage beast. But the real problem is some small things that may be mobile plantlife. The battle against the beast causes the small flora/fauna to rapidly multiply, threatening to suffocate the mutant twins with their numbers.
Anelle is a good-hearted girl who tries to persuade her father to stop. But Marvel agrees to help the Skrulls to save his allies' lives.
Back on Earth H. Warren Craddock, head of the Alien Activities Commission, tests an alien detection device on the men who were devolved into cavemen by the Kree in #91. It reacts to the traces of Kree influence.
In Avengers Mansion Clint Barton destroys his stock of Hank Pym's growth serum, saying that his failure to stop the Skrull saucer last issue means that he isn't worthy of being Goliath. But the remaining drug in his system will give him a short time left as a giant.
Vision arrives with his news. And Nick Fury calls to warn the Avengers to make themselves scarce. But he's too late, as Craddock sends 3 SHIELD agents in armoured suits called Mandroids against them. The Mandroids have been designed and trained by Tony Stark to take on even the Avengers. (Though Stark kept some of Iron Man's abilities secret from them.)
In the middle of the battle the Inhuman Triton crawls out of a drain.