Synopsis
Winter Soldier/Bucky Barnes recruited Atlas, Fixer, MACH-X and Moonstone as his new Thunderbolts team from the ruins of the Pleasant Hill prison (in the Avengers: Standoff event). (Abner Jenkins/MACH-X wasn't actually a prisoner - he was 1 of the staff.)
He leads the group in a raid on a SHIELD installation. Since Standoff he no longer trusts SHIELD, and the 'Bolts are here to destroy the info SHIELD has amassed on the super-community. (And copy some of it for themselves.)
Fixer's tech gets them in, but they're faced with a bunch of Guardsmen. Most of the team play nice, but Moonstone uses a combination of psychological attack and lethal force.
When Fixer has dealt with the data MACH-X leads them to an aircraft in which they can escape. After Atlas has knocked a hole in the wall big enough to fly through.
When they return to their secret underground base in New Mexico they are greeted by Kobik, the little girl who is really a Cosmic Cube and was used by SHIELD to keep the PLeasant Hill inmates 'sedated'.
We learn that Bucky is still Nick Fury's replacement as the Man On The Wall who guards the Earth against external threats. He saved these guys from PH to help him do that job. The SHIELD intel they've taken will update Fury's old files.
Kobik overhears the team bitching about their rubbish hideout. Next morning they wake to find that she's transformed it into their dream home. Bucky thanks her, but warns her it's not safe to use her powers because SHIELD might be able to track her.
Fixer integrates the data and applies his own programs to filter and cross-relate the result. He derives a ranked threat list, and the biggest signal come from Georgia. Nick Fury's files say it matches the comms of certain aliens.
The team fly to investigate, leaving Kobik behind again. But the 'little girl' materialises in the plane, and they agree to take her along.
What they find when they get there is a building full of things similar to Inhuman Terrigen cocoons. But Fixer says that isn't what they are. MACH-X and Moonstone want to destroy them all but Bucky wants to investigate further.
This triggers a head-to-head clash between Karla Sofen and Bucky. Karla thinks she should be leader because she's the most powerful. Bucky points out it's only her Moonstone gem which gives her that power. She responds by challenging anyone to try and take it from her.
Unfortunately Kobik takes her literally. She rips the gem out of Karla's chest and transforms herself into a mini-Moonstone (seemingly taking half of Sofen's armour as well).