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McGrath was a pirate on the Fancy in the 17th century. He was injured while fixing the rigging, giving him the black spot. The Siren appeared, planning to take McGrath. He tried to fight the Siren, but was taken by her to her ship. He joined the rest of the crew when they took the ship for themselves. (TV: The Curse of the Black Spot)

Some time later, the Doctor recruited Avery to help him with an attack on the asteroid of Demon's Run to rescue Amy Pond. McGrath and the crew boarded Madame Kovarian's ship during the attack and subdued its crew, preventing her escape. (TV: A Good Man Goes to War)