Bikini Bottom

Bikini Bottom is a world that appears in Dark Storm and Dark Storm 2. It's not yet confirmed to appear in DS3.

Dark Storm
Stephen arrives on the Island. He has to find the Diving suits to explore. After finding them, Stephen and his party member put them on and can enter the Ocean. The logo appears, and Stephen arrives on Conch Street. Here he teams up with Spongebob to stop King Jellyfish from finding the core. The Air meter is introduced. In order to fill it, the player must collect air bubbles or defeat enemies. When the air meter is empty, Stephen starts to lose health. When Stephen finds King Jellyfish, Spongebob gets brutally stung. Stephen rushes Spongebob to the hospital, where King Jellyfish attacks. Stephen fights King Jellyfish, and wins! After defeating King Jellyfish, Stephen learns Healius Minimus and uses it on Spongebob. Soon, the core is found in Gary's shell. You know what happens next. Stephen seals it.

First Visit
Stephen arrives after sealing Planet Shroob. Spongebob remembers Stephen, and so Stephen sets out to seal the core. King Jellyfish decides to send the Whirlpool Darkness to distract Stephen while it searches for the core. After a tiring battle, the Whirlpool disappears. Spongebob upgrades Freezius Minimus to Freezius Maximus. King Jellyfish is then chased by Stephen and Spongebob to the Grotto. Stephen fights King Jellyfish, and the giant Jellyfish dies. The core is then found under Spongebob's bed, leading Stephen to seal it.

Second Visit (optional)
Stephen comes back after unlocking Dreamland. Here he looks for changes, and finds the sunken Club Penguin iceberg. Stephen asks Spongebob about it, and is told that the Iceberg drifted in space until it reached Bikini Bottom.

Trivia

 * King Jellyfish doesn't merge at all with Darkness in DS2
 * Many fans said that Plankton would've made a better O.O.V.A.L. member than King Jellyfish
 * It is unknown how in DS2 the Iceberg got into space