The Mawgu

The Mawgu is the main antagonist of "Nicktoons: Battle for Volcano Island". He is the archenemy of the Wise Old Hermit's people. He escapes from his prison and attemps to take revenge on the people of the Island who imprisoned him with a terrible ooze that can corrupt anything and make them his minions.

To do this, The Wise Old Hermit summoned "The Chosen Ones" to stop him (Spongebob Squarepants, Patrick Star, Sandy Cheeks, Squidward Tenticles, Danny Phantom, Sam Manson, Tucker Foley, Timmy Turner and Jimmy Neutron). The Chosen Ones had to overcome many challenges and enemies, both weak (like sand monsters and seagulls) and strong (like The Great Carapace) until they finally got to The Mawgu. A great battle ensured.

While Timmy, Patrick, Sandy and Sam distracted the monster and Danny and Spongebob fought it and it's minions (with a little help from Squidward), Tucker had finished the Rip-Zipper he and Jimmy were working on and sealed The Mawgu inside the "Rip" right after he says "This isn't over, Chosen Ones!". Finally, the island is at peace and the islanders have carved the heroes faces into the side of a mountain.