Cartax

Cartax is a major character in The Amazing World of Gumball. It serves as the main transportation of the family. In "The Routine," it is revealed that Cartax can communicate with Richard, albeit in whinnies as though it is a horse.

Season 1

 * "The End": Richard attempts to drive his kids to Food N' Stuff, but they end up walking.
 * "The Painting": It briefly appears after Nicole cleans it.
 * "The Prank": Gumball and Darwin hide behind it when pranking Richard.
 * "The Party": Richard drives Gumball and Tina to Rachel's party.
 * "The Club": The Wattersons and the reject club are in it.
 * "The Ape": The Wattersons chases down Miss Simian's car with it.
 * "The Car": It is smashed by The Robinsons.
 * "The Fight": Nicole drives her son to the junkyard.

Season 2

 * "The Fridge": Nicole drives Gumball to the desert.
 * "The Phone": Gumball and Darwin hide behind it.
 * "The Job": Nicole, Gumball, Darwin, Anais and Larry chase Richard.
 * "The Treasure": Appears in Richard's flashback.
 * "Christmas": The Wattersons run over Santa in it.
 * "The Bumpkin": Richard drives it through multiple locations.
 * "The Flakers": Nicole drives it on the way back.
 * "The Authority": Richard drives Gumball, Darwin and Anais to get milk, and gets chased down by Nicole and Granny Jojo.
 * "The Virus": It makes a brief appearance being taken over by the virus.
 * "The Hero": Richard drives to the junkyard to save his kids.
 * "The Dream": It makes a cameo in Darwin's underwater dream.
 * "The Game": Nicole drives it from the backseat.
 * "The Limit": Nicole forces her family to wait inside the car numerous times.
 * "The Finale": It first appears in flashbacks from "The Bumpkin" and "The End," and later makes a cameo near Chunky Bite.

Season 3

 * "The Fan": It briefly appears in a flashback from Sarah's stalker video.
 * "The Coach": Richard can be seen driving his kids (who's mouths are wide open) to their house.
 * "The Name": Nicole drive the Wattersons to the City Hall.
 * "The Gripes": Richard drives Anais home.
 * "The Vacation": The Wattersons go on a road trip.
 * "The Allergy": Richard drives his three kids home, and later he and Nicole attempt to drive to the Desert, but fail when Darwin sneezes both of them out of the car.
 * "The Password": Richard races Gumball and Darwin to Ripley 2000 on it against Nicole on the minivan.
 * "The Pizza": The Wattersons attempt to drive it, but it breaks down and its pieces get stolen by Elmore citizens.
 * "The Oracle": Gumball, Darwin, Anais, and Nicole go to the mall in it.
 * "The Nobody": Gumball and Darwin watch, Nicole, Richard, and Anais leave in it.
 * "The Egg": The Wattersons and The Parhams attempt to drive it.
 * "The Money": Richard crashes it through the gas station store on the way to the car dealer.

Season 4

 * "The Return": Richard drives it when trying to rescue his kids.
 * "The Signature": Richard drive the Wattersons to the City Hall.
 * "The Parking": The Wattersons attempt to find a parking lot.
 * "The Routine": It has another major appearance, revealing its name and as the vehicle for Richard's quest.
 * "The Comic": Nicole forces the shadow person to fix it.
 * "The Wicked": It gets hijacked by Mrs. Robinson, who rampages through the mall.
 * "The Origins": Nicole drives Gumball back from the mall, and is later seen again at the parking lot when Richard returns to it after failing to purchase another fish.
 * "The Origins: Part Two": Richard drives Gumball and Nicole to the mall.
 * "The Girlfriend": Richard leaves the school in it.
 * "The Signal": Richard drives Gumball and Darwin to get ice cream.
 * "The Night": Anais gets dragged along outside the car as a doll.
 * "The Misunderstandings": Richard drives past the house and then reverses into a lamppost after thinking that Gumball is trying to direct him. Richard later drives it to the mall under Gumball's instruction.
 * "The Roots": Nicole drives the Wattersons to the mall and later to the lake and back.
 * "The Blame": It appears parked outside the school. It is later parked outside the house.
 * "The Detective": Richard rams into the garbage truck driven by Dolphin Man's.
 * "The Fury": Nicole drives Gumball, Darwin and Anais to school, and later Yuki damages it by kicking it repeatedly.
 * "The Compilation": Footage of Richard crashing through the gas station store in "The Money" is played.
 * "The Disaster": Nicole drives the Wattersons to the mall and it gets destroyed in the parking lot.

Season 5

 * "The Rerun": Nicole drives the Wattersons to the mall and it gets destroyed in the parking lot again. It later makes an appearance after the rewind at the end, showing the Wattersons on it driving through the parking lot.
 * "The Code": It is shown in a drawing made by Gumball.

Trivia

 * In Season 1, Cartax is a generic representation of 1980s–1990s American station wagons.
 * The front emblem is similar to the Pontiac "Arrowhead" emblem.
 * The rear end is loosely based on the 1974–1976 Oldsmobile Custom Cruiser, with "GUMBALL" badging in place of the Oldsmobile badging.
 * It carries the front license plate "ODH 22", however the rear license plate is covered in mirrored graffiti (reads "T277B" when non-mirrored).
 * In "The Club," it is seen in an earlier design without a trunk lid, no window stickers, a slightly different taillight shape and a non-mirrored rear license plate with a thinner frame.
 * Cartax receives a redesign in Season 2, and resembles the 1978–1983 Ford Fairmont Squire
 * The front and rear ends however, are based on the 1977–1978 Ford Pinto Squire.
 * The rear license plate is no longer covered in graffiti, and reads "ODH 22" like the front license plate.
 * Cartax's name was revealed in "The Routine."
 * Other than Cartax, the Wattersons also own a minivan which resembles the 1984–1986 Dodge Caravan.
 * It serves as the secondary transportation vehicle of the family, mainly driven by Nicole.