Prehistoric Fish

This huge fish appears in the beginning of the SpongeBob SquarePants episode, Ugh.

Description
It appears to have a whale-like body with purple skin, large light blue scales located on its back similar to a stegosaurus, small fins, small eyes with thick eyebrows, sharp teeth jutting out of its lower jaw, and a blowhole similar to a modern whale.

Overview
In the beginning of the episode, the creature wakes up and makes a loud noise similar to SpongeBob' alarm clock.