After learning that he is the son of a mortal woman and Poseidon, god of the sea, twelve-year-old Percy is sent to a summer camp for demigods like himself, and joins his new friends on a quest to prevent a war between the gods.

The Underworld usually isn't really meant to be a fun place - but tell that to Hades! He loves the dark and the stinky smell of sulfur. However, there is one thing that Hades is not a fan of: dogs. And when Zeus and his fellow Olympians encounter Cerberus - a snarling, three-headed dog - Hades must conquer his fears and tame the hound so everyone can continue into the Underworld and deposit their Titan prisoner, Oceanus, back where he belongs!

When ten-year-old Zeus is kidnapped, he discovers he can defend himself with a magical thunderbolt.

"Phew, it's hot! Under the titan Hyperion's rule, the sun is burning even brighter than normal and scorching everything in northern Greece--including the villagers! The Olympians are forced to play a sizzling "game" of Dodge the Sunbursts as Hyperion hurls giant fireballs that could fry them to pieces! Armed with some clues, Zeus, Poseidon, and Hades set out to figure out why in the world Hyperion has been making things so hot. They also need to rescue...

With a giant spiderweb in the sky with the words "Surrender Olympians" written in it, Zeus and his friends know they are in for a fight, but the webs actually contain a hidden gem, Athena's magical item.