Ice cream is thrown on the sewer. Red and Yellow battle over the melted drippings. Next, a Mosquito enters the sewer on a quiet night. Red and Yellow become victims of the mosquito's bites, but Violet appears to challenge it. Later on a rainy day, a bottle cap is accidentally caught on Yellow, and he starts to tap dance. Red, watching from a distance, looks for his own bottle cap.

After being struck by lightning, Red and Yellow gain a mysterious power. They start a fiery showdown to get the candy they have been fighting for. Next, a stinky fly flies into the sewer. It smells so bad that everything it touches dies. How will Red and Yellow kick the fly out? Later, a long piece of spaghetti falls into the drain. A tug of war ignites between Red and Yellow.

Yellow walks toward Red chewing gum and blows a bubble. The bubble floats in the air and pops on Red's head. Angry, Red tries a flying kick, causing an earthquake. Next, some unknown liquid falls into the drain and onto Yellow's head. Suddenly, Yellow's hair starts to grow. Later, Red and Yellow attempt to escape the flooded sewer!

When a swarm of ants pass in front of Red and Yellow, they start picking up food from off their heads. Next, Red and Yellow get a stomachache after eating mushrooms. Running towards the public toilet, they're quickly met by a long waiting line. Later, Red encounters a mummy that looks like his father.

Red and Yellow try to save a sausage frozen in hail. Next, a sausage falls down into a deep pit. Yellow finds something scary down there. Later, a chewed piece of gum falls down the sewer. Red thinks it is dirty, but Yellow can do so many fun things with it.

Two larva, who live in the gutter under a busy street, examine all the strange things that fall through the drains into their subterranean world.