The Amazing World of Gumball: Season 8:

This is an idea for season 8. It contains 9 episodes.

The Backstory:
This is a flashback episode. Gumball tells his friends about how he and Penny first met each other.

The Alien:
Gumball thinks that Darwin is an alien. He becomes paranoid and tries to capture him.

The Skunk:
Gumball finds a skunk which causes him to smell. Everyone in Elmore is disgusted by it.

The Aquarium:
Darwin gets taken away by the aquarium owners because he is a "extraordinary mutation." When he is there, Darwin makes an escape plan to get him and the other fish free.

The Dinner: (Thanksgiving Special)
Gumball and Darwin need to find every ingredient for the thanksgiving dinner before it is too late. They end up going extreme lengths for this.

The Choir:
Gumball enters the choir class, but realized he has a terrible singing voice. Carrie and Darwin end up finding a potion to make it better However, there are some side effects...

The License:
Darwin gets a drivers license on accident from the Elmore DMV. He starts causing rampage because he doesn't know how to drive

The Switch-Up:
After a big prank caused by the student in school, the teachers are finally fed up. They give the students the privilege to be the teachers. Soon, they realize how hard it actually is.

The Graduation:
Series finale:

Gumball gets to graduate on the last day of school, but Darwin didn't graduate, causing Gumball to go to College without him. In the end, Gumball leaves and writes a note to Darwin, saying: "see you soon!". And everybody said bye to Gumball.