Tyson is a cyclops and is son of Poseidon which makes him Percy's younger half-brother. Tyson has a love of ponies and met Percy at his 7th grade school. Tyson came with Percy and Annabeth when they sneaked out of camp to save Grover and take the Golden Fleece. Tyson is scared of Grover and is allergic to him and Grover is terrified of Tyson. Tyson worked in Poseidon's armory for a while before leading in battle against the Titans.
