The Cú Chulainn was a Morrigan-class patrol destroyer. It was the ship that nearly caught the Rocinante during its gravity assist to Ganymede .


After the initial battle at Ganymede, the Cú Chulainn was hidden behind one of the moons orbiting Jupiter. The Rocinante narrowly avoided being detected by the Cú Chulainn whilst using thrust and slingshotting to reach Ganymede undetected.


The ship was unnamed until the official breakdown of the class, in which the ship's name could be seen, and the number 512 was on the 3D model shown.