Spongebob Squarepants: Books 7 & 8: #7: SpongeBob Naturepants; #8: SpongeBob Airpants: The Lost Episode (Unabridged‪)‬

#7 — Spongebob Squarepants — NaturePants
Sick and tired of feeling shackled to the Krusty Krab, SpongeBob is longing for a change. Deciding to throw in the spatula and live among the jellyfish, SpongeBob embarks on a new life of freedom -- but will it be worth it? Join SpongeBob as he sets out for the open sea.

#8 — Spongebob Squarepants — Airpants — The Lost Episode
It's a bird! It's a plane! It's...SpongeBob! SpongeBob dreams of flying with the jellyfish. And this time he sets out to make his dream a reality. From a makeshift flying machine to a hapless bat costume, SpongeBob's airborne attempts are grounded until he accidentally invents a pair of superherolike flying pants. But SpongeBob soon realizes that being a superhero isn't all it's cracked up to be. Will he ever be able to live as a mere mortal again? Find out in this aerodynamic adventure!