After accidentally killing a dragon, Wiglaf hopes his friends at Dragon Slayers' Academy will be able to help him prove himself a hero when he faces that dragon's mother, Seetha, the Beast of the East.
Wiglaf and his friends Angus and Erica find themselves teamed with the obnoxious Bragwort to represent the Dragon Slayers' Academy in an unevenly matched contest at the All-Schools Brain-Power Tournament.
Alarmed by a prophecy that the world will end with the arrival of the year 1000, the students of Dragon Slayers' Academy get some advice from a boy who has traveled back from 1999, Zack from the Zack files by Dan Greenburg.
While Headmaster Mordred is trying to impress a new student, who he believes to be the first female at Dragon Slayers' Academy, the ghost of one of the school's founders besieges the halls seeking his stolen gold.
A ransom note received at Dragon Slayers' Academy sends Wiglaf and Angus to the rescue of the supposed victims but upon arriving at Keep Away Mountain Cave, they discover that an elaborate prank has put them in danger.
Wiglaf and his classmates come to appreciate their elders when they learn that only a group of retired knights can save their school from the world's oldest living dragon, Grizzlegore--if they can get back in shape in time.
When the gold-hungry headmaster of Dragon Slayers' Academy realizes that he can make money running a summer camp, Camp Dragononka is born, but there is something not quite right about the activities and the setting.
While Wiglaf and his friends search for their dragon, Worm, DSA's money-hungry headmaster, Mordred, is turning the school into a casino, rushing all of the students through graduation and out on their own.