Cap'n Slipp was a searat and also the brother of Strapp. He was the former captain of the Pearl Queen after he stole her from Finnbarr Galedeep. However, he and his brother got into an argument, and he was left alone on the Pearl Queen while his crew went to have a party with Strapp on the Shalloo. Finnbarr took advantage of this and threw Slipp overboard, reclaiming his vessel. Slipp tried to swim to the Shalloo and get help, but was betrayed by his brother, who left him to drown and chased the Pearl Queen. He washed up on the shores near Mossflower Woods with former boatswain Blaggut, who also had been left behind. Slipp abused and beat Blaggut often, taking advantage of the simple rat's gentler nature.