The island is on fire, so the tribe and the Louds need to evacuate and solve the problem.
One night, the Louds and the tribe were eating a shark that got too near of the coast (obviously dead). When they finished eating, they went to sleep. But they forgot to extinguish the fireplace.
When the night was advancing, the fire was covering more and more territory, burning palmtrees, bushes, and kelp in the process.
Suddenly, at 3.00 am, Lori awaked to search a midnight snack (not a Krabby Patty). When she got outside, it was alarmed at seeing the fire. She immediately awaked the others to evacuate the island, and rescue much people and food as possible.
Seeing this as a chance to save the day, Lisa maked a similar to her 'extinguisher recipe'. She gived everyone a jar to carry it, and shot it.
Meanwhile, Lincoln ran to save Frank's family. For his bad luck, his family live at the other side of the island (remember that the island's area is only 1sq. km.). Even worse, the fallen trunks blocked the way, so Lincoln had to go around the island. He reached them (after 50 minutes). He taked them to the skywire he built (from episode 3), that he finished yesterday. The skywire goes to New Caledonia.
One day later, they came back to the island to see the disaster. There was only ashes and smoke. There were some puddles, so it's obvious it rained the other day. Just don't leave the fire on the next time.