When Principal Brown announces that the school will be merged with a prison due to budget cuts, Gumball and Darwin convince Mr. Corneille (the laid-back, pixilated frog teacher first seen in "The Others") to train for a cage match against a Portuguese fighter, Joao "The Grave" Diga.
Tropes:
- Asleep, Not Meditating: Mr Corneille tries to prepare for a fight by meditating, only to fall asleep with Comical Nap Drool coming out of his mouth.
- Brick Joke: Gumball and Darwin get hurt walking into things while trying to lick their elbows. Later, it's revealed that Mr. Corneille got hurt the same way.
- Comically Missing the Point: When Mr. Corneille walks into the nurse's office sporting a black eye and chipped tooth.Nurse Markham: Oh my gosh, your face! What happened?Mr. Corneille: Pretty mama, handsome daddy. [clicks tongue and points to himself]Nurse Markham: No, I meant your black eye.
- Curb-Stomp Battle: Not surprisingly, the fight (if you can even call it that) lasts all of 2 seconds before Mr. Corneille gets literally flattened.
- A Day in the Limelight: For Mr. Corneille and Joan Markham (the Band-Aid Nurse)
- Demon Head: Gumball when asking Mr. Corneille to teach him cage fighting.
- Double-Meaning Title: Twice over. The title either refers to everyone thinking that Corneille is a cage fighter, the actual caged fighting ring, the school being forced to merge with a prison, or the hamster cage that Corneille slammed his face into.
- Faceless Masses: When the audience is shown from the top view, they are just some colored rectangles.
- Florence Nightingale Effect: Mr. Corneille pretends to be a cage fighter only because he had a crush on the school nurse. She found the thought of him as a tough fighter sexy, and he went along with the fight just to get her to kiss him.
- Furry Reminder: Gumball purrs when Darwin strokes his chin.
- Given Name Reveal: The nurse's full name is revealed to be Joan Markham.
- Last-Name Basis: Nurse Markham decides to stick with calling Corneille by his last name when he reveals his first name is Moonchild.
- Mass "Oh, Crap!": The entire stadium when Joao crushes Mr. Corneille with one punch.
- Odd Organ Up Top: Joao is a giant with a fist for a head.
- Poor Communication Kills: Mr. Corneille mentioned that he got his black eye from the cage, which Gumball thinks it means that he's a cage fighter. Turns out Corneille meant that he walked into the hamster cage, and he only went along with it to charm the school nurse.
- Punch a Wall: Mr. Corneille punches a wall when Gumball tells him he can't fight, surprising them both when it appears to make an enormous hole. Unfortunately, it turns out to be an escape tunnel from one of the prisoners being housed in the school.
- Reaching Between the Lines: When Gumball calls Joao's manager over the phone, the latter makes several repeated Spit Takes and spits coffee in Gumball's face each time.
- Suddenly Shouting: "TEEEEEEEEEAAAAAACH UUUUUUUSSSSSSS!"
- Training Montage: Parodied. Mr. Corneille's training for the fight consists of not training, under the notion that it just tires him out. So he just sits on his office while a song about not training plays, until Gumball and Darwin (and the singer) get tired of just watching him do nothing.
