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.
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.
Upon superstitious headmaster Mordred's orders, the returning students and new lasses of Dragon Slayers' Academy deck themselves in lucky charms on Friday the thirteenth, but luck may not help when a wicked dragon arrives seeking revenge.
Wiglaf and his pig, Daisy, are spending a DSA holiday with Erica at the Royal Palace, but King Ken has come down with the pox and Queen Barb's great healer is a not-so-great wizard who leaves King Ken speaking Pig Latin.
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.
Wiglaf and his friends are on a mission to rescue Worm, the dragon they have raised from an egg, and are surprised to learn that the captor is not a gang of dragon slayers, but rather a young giantess who wants to keep Worm as her house pet.