Abraham Gray serves as a sailor aboard the Hispaniola during the Treasure Island voyage. Initially siding with Long John Silver's mutineers, Gray's background as a first-time sailor from the countryside makes him less hardened by piracy than the veteran crew. This relative innocence leads him to defect when Captain Smollett offers redemption during a pivotal moment. Gray seizes the chance for loyalty, fighting through adversaries to join the captain.

After defecting, Gray actively helps defend the stockade against the pirate assault, his combat abilities proving effective. He later joins the group ambushing Silver's remaining pirates at the treasure site, aiding in their defeat. Gray then assists in transporting the secured treasure to the ship.

In the aftermath, Gray receives a portion of the treasure. Unlike others who squander their shares, he uses his responsibly. He invests in advancing his maritime skills, buys partial ownership in a ship, and establishes a stable life through marriage and family. His fate contrasts with less principled characters like Dick Johnson, abandoned on the island. Gray's arc underscores redemption through loyalty and the positive outcomes of maintaining moral integrity.