The "5 headed beast" or "sea creature" is the Hydra. You know this because you get a scale from it.
To beat the Hydra : wait until one of the heads tries to hit you. When it extends, jump up and come down on top of it. Repeat for the other heads, but if you miss too many times, the other heads will wake up again. Swim under and get the Hydra scale.
There is no dragon on Mythology island. There is Cerberus, the three-headed dog that you beat by lulling him to sleep with the red pipe (flute). Play blue-green-yellow-blue-red-green. There is the Hydra, who you beat by jumping out of the way when he shoves his heads at you, and landing on top of each one to knock it out (five times).
There is no scale. I have already beat it.
Talk to the minotaur.
In the Hydra cave, approach the five-headed giant monster. It will try to hit you with one of its heads. When it does, jump before it can hit you, then land on top of the head when you come down. Knock out all five heads the same way, before any can wake up again. Swim down to get a scale from the Hydra.
You can't.
Wimpy Wonderland Red Dragon Island Counterfeit Island Mythology Island Astro Knights Skullduggery
no there is no way at all
Jump over it and move right, where you can exit the pit.
you jump on each head to put it to sleep
zues is god in mythology island. he was a mean dude. bonus. in order to beat him you must have hades crown and poisods Triton.avoid his lightning and hit him with yours. tada
On Mythology Island in Poptropica, the final thing you do is defeat Zeus in a battle to stop him from taking over the island. Once you defeat Zeus, you will have completed the main quest of the island and can claim your medallion.
That completes the Mythology Island quest, and Athena gives you the island Medallion. You can leave Olympus and go to other islands. Wearing the Hades Crown on any island lets you grow into a giant (press the spacebar). But it does provide any advantage on any island.