The Kyln is an interstellar prison made by the Nova Corps.
Gamora, Groot, Rocket, and Star-Lord are taken to Kyln by the scandal they caused in Xandar. Arriving Peter is harassed by an inmate but thanks to the help of Rocket and Groot, the prisoner leave it alone. While all prisoners slept, Peter wakes up and sees that some prisoners attack Gamora, he sneaks and go to help Gamora.
Peter tries to convince Drax that no longer with Ronan, Drax believes him after the insistence of Quill. The next day, the group plans the escape but the escape began much earlier by Groot, who took an artifact that was necessary for the end of the plan.
The group manages to escape after some complications and travel to Knowhere to sell the Orb. After the meeting with Thanos, Ronan and Nebula goes to Kyln, after failing to find Gamora, Ronan orders to kill everyone in Kyln.