Orange Spodumene

The Worm Monster is an unnamed creature than inhabited the bottom of the ocean.

Bubble Buddies
In Bubble Buddies the Worm Monster is seen at the bottom of the ocean, eating seaweed; the creature then dives into the ground causing the ground to shake and crack, making Steven and Connie fall into a pit. The monster then re-appears after Connie and Steven reach the top of the ocean where it dives from behind them and chases them to shore. Steven notices the creature is attracted by Connie's bracelet; therefore he grabs it and leads the monster around the pier supports causing them to break and then fall onto the Worm Monster.