Loose lips sink ships: this is a lesson everyone under the sea knew well. Since tourist season was slow, a bunch of fish got together and parted their lips to sink the entire Spanish armada as it was on its way to England. Now Atlantica had plenty of tourists, but not enough entertainment. So King Triton ordered Sebastian to perform a musical.
So Sebastian held tryouts for his musical. Some tuna auditioned, followed by some trout, sharks, seahorses, stingrays, and various other breeds of fish. But the real stars were the pharmed fish. Hordes of those genetically modified, mass-produced fish pooled in and recreated the opening to the Chinese 2008 Olympics. They were an instant win, but were cancerous, and they subsequently all died and took down everyone who had come into contact with them.
Except Sebastian. He had diplomatic immunity.
Anyway, Sebastian was hard-pressed to find any replacement singers since everyone was dead, dying, or being ingested by hungry, drowning Spaniards. So he went to another sea to look for new talent. He found himself in the Sea of Japan where the nuclear irradiated waters filleted the fish. Not giving up, Sebastian's destination was supposed to be the Indian Ocean, but he found himself instead in the middle of a muddy lake. There, some kips of the mud greeted him.
"Mud," said one.
"Kip," said the other.
"Wot be up, mon?" said Sebastian.
"Mud," replied one.
"Kip," replied the other.
"I said: wot be up mon?" said Sebastian, now irritated.
"Mud," replied one.
"Kip," replied the other.
Aggravated, Sebastian turned to leave. But a rather large, menacing kip of the mud blocked his path.
"u dont like mudkips?" he said.
"Wot be up mon?" said Sebastian.
"do u like mudkips?" The kip cracked its nonexistent knuckles.
"Dem de kips?"
The giant kip of the mud grabbed and squeezed Sebastian. "so i herd u liek mudkips?"
Sebastian nodded. He had found his talent.
Later, he returned to Atlantica with all the kips of the mud in tow. Unfortunately, the Spaniards had gutted and feasted on the rest of the population, including the fishy king and all his fishy daughters. When Sebastian arrived with his kips, they were all skewered with a Spanish-made Pooh stick and fried, fricasseed and eaten.
When the Spaniards had eaten everyone, they eventually remembered they couldn't breathe under water and all drowned. Roo then dived into the water with some scuba gear to recover the Pooh stick and return it to the Fellowship of the Pooh.
The end.