Staines Down Drains is an Australian cartoon series that aired from 2006 to 2007 but still reruns in Germany as of February 2014, created by Jim Mora.
The show is about two siblings named Stanley and Mary-Jane Staines who are shrunken down and sucked into a portal in the basement sink to Drainland, a place threatened by the evil Dr. Drain.
Drainland Unplugged (S01E01)
During their first adventure in Drainland, Stanley and Mary-Jane are attacked by a giant mutant teddy bear cookie monster. Being the bravest of the two, Mary-Jane solves this by eating it. Soon the two are overstuffed and stay like that until they escape a giant rat.
Later, Vegety Bill, Blobert, and Herk spray water to fight back against the Goblers and the potato salad mutant.
Meet Dr. Drain (S01E03)
Dr. Drain gets his gas mask stuck to the laughing gas canister when defeated by Stanley, swelling him up and getting him treated like a tennis ball.
Land of the Giants (S01E04)
Mary-Jane is allergic to honey and balloons up whenever she gets close to it.
Later, the Goblers find their parts expanding, making them seem fat for a while, when taking a growth potion.
In the Soup (S01E10)
Betty's angel and devil appear when she finds an overdue burger, of which the angel force-feeds the devil to get rid of her.
While in the Staines' kitchen, Herk tries chili out of curiosity and cools himself down with water.
Hair Today (S01E18)
Dr. Drain orders the Goblers to take care of the leaks by covering them up with their mouths.
Dentures of Death (S01E20)
Blobert and Herk end up with stomach aches after eating moldy cheese.
The Goblers fatten themselves up with rotten wedding cake, this making them grow tall enough to capture humans.