Cerberus

Cerberus is a three-headed canine in Greek Mythology. It is seen guarding the underworld on Mythology Island.

In Greek Mythology
Cerberus is the guardian of the gates of the underworld. His job is to not let anything alive and nothing live or dead out. His parents were Echidna and Typhon, and his brother was Orthrus.

Heracles' 12th labor
Being captured (without weapons) was Heracles' 12th and last labor. Heracles paid Charon a Dracma, and after going to Hades' to ask for Ceberus (who agreed), he went to battle the creature without weapons, since Hades wanted him to.

But he first met Theseus and Pirithous just hanging around.

In the battle, Ceberus was easily defeated (you can see why) and tied to Heracles' back.

After Heracles took Ceberus to the surface, King Eurystheus told him to return the beast.

On Mythology Island
Zeus asks you to get one of his whiskers, which you soon discover that it is impossible, since he bites you if you try.

You'll find him at the other side of river STYX.

If you go to Apollo's temple on the roof, you'll find a hint: As you look at a glowing olive, Athena says, "Music soothes the savage beast."

Inside the temple, go to the so you can get a pipe. Go to Euterpe, the muse with the pipe, and do what she says.

She'll then give you pipe music and tells you that you can use the music to put Ceberus to sleep.

To defeat him, use the pipe and a song to put him to sleep, allowing you to take one of his whiskers.

Goofs

 * Factual Errors: A pipe is used to calm Cerberus. In greek mythology, only a lyre can do that.

Trivia

 * He's about three poptropicans high.