Final answer:
In the 'Percy Jackson & the Olympians' series, Percy and Tyson are attacked by Cyclops during a game of dodge-ball.
Step-by-step explanation:
The attack on Percy and Tyson during dodge-ball was carried out by Cyclops. This event occurs in Rick Riordan's Percy Jackson & the Olympians series, where a seemingly ordinary game of dodge-ball turns into a dangerous encounter with mythological creatures. In the books, dodge-ball is often used as a means to showcase Percy's demigod reflexes and battle skills, as well as to further the storyline by introducing elements of Greek mythology into modern settings.