Here are some ideas for season 4. This may air in 2014.
Gumball finds a toy train that is cursed.
Gumball and Darwin find a monster in the closet.
This is a Halloween special and a spoof of Resident Evil.
Darwin destroys the robinson's house by accident and becomes evil.
Gumball must pass a big test in order to switch from public to private school
Darwin finds a strange cave, and gets lost, so Gumball must find him.
Gumball gets his sweater torn and must get a new one but apparently they were sold out of sweaters so Nicole buys Gumball a jacket instead which makes him more cooler than before.
Darwin gets bit by a vampire and tries to bite Anais, Skydancer, and Gumball.
Anais lies that Gumball was a famous person, gets a little overboard and the lieing becomes reality.
The Amazing World of Regular Show Special
Mordecai And Rigby kidnap Penny And Rachel,so it's up to Gumball To save Penny,and Darwin to save Rachel
Gumball and Gummy are on a faceoff to be class president.
Anais tries to find her hidden talent.
The Trap: Part 1
The Whirlettes and Skydancer get traped in a tar pit, Gumball and the gang try to save them but Darling ends up drowning in the tar.
The Trap: Part 2
Darling is still drowning in the tar and Darwin (sort of) tries to save her from the tar pit.
Anais's birthday cake makes her evil and disloyal to her family.
Masami tries to help Gumball and Darwin to control their anger.
Darwin doesn't know how everyone can make the world a better place.
Gumball and the gang meet Rosemary, a greedy, and rude dragon.
Gumball and Darwin prank Dad for a sasuage and must get him back before they get into trouble.
The Amazing World of Regular Show 2
Mordecai and Rigby get intoxicated at a party, and run over Gumball. He goes to the hospital, and is pronounced dead, but Penny refuses to give him up, So Darwin calls Techmo and Rigby calls Death to save Gumball, and the two work together to save Gumball. Elapsed Time - 240 Minutes
- The series finale is gonna reveal Penny's and Gumball's Whole relationship