While stuck in an animal testing lab, rats Mike and Phil enter a love triangle with their imaginary friend, which inadvertently reveals the truth of their situation. A pair of fleas discuss their basketball dreams and ponder life, while stuck on a monkey's back. An algae questions his existence.

As a virus sweeps New York, teen pigeon Jacob's jealousy over his angelic little brother prompts a wacky spirit quest that teaches him about courage and responsibility. Two foxes rap about a hard-knock life on the city streets.

When an exterminator puts a roach town in crisis, the survivors band together to travel to the world outside of their wall and guarantee the survival of their species. A group of seagulls, stuck together by a piece of litter, struggle to live their lives as one.

An uninitiated rat gets mating tips from his friend at a subterranean party. A pair of police horses complains about an old acquaintance who's made it big. A bed bug has a midlife crisis.

A naive male pigeon prepares himself for motherhood, while another is challenged by a New Jersey rival. One caterpillar's metamorphosis is another's lament.

Two privileged feline siblings find their perfect day interrupted by a crafty alley cat. Bored with the monotony of his life, a goose sets off on his own, and attempts to bond with a flock of Central Park swans.

A papillon is thrust into an unwelcoming dog park. A dog-walking group deals with an unexpected secret. Two dogs dissect their owners' first date.

A rat invents pants. A moth tries neon light for the first time. Two fish couples have a tense dinner.

Pigeon Phil runs into trouble after he's reunited with the dad who abandoned him, while pigeon Mike struggles to encourage his son to be a seagull scout. Two turtles come to blows over the love of a mechanical frog, while a skunk learns the unfortunate truth about his date's past.

A pair of flies experience the highs and lows of life - finding success, failure, love and loss over the course of just a few hours. A self-conscious carriage horse is encouraged to "let it out" by a peer. Bodega-dwelling cats rap.

After their home collapses, two young squirrel brothers find their survival skills tested on a journey through a tree trunk towards freedom, meeting rodent friends and foes along the way. A snake and her mouse prey face off; puppies at a pet store settle a turf war.

The thrilling conclusion of squirrels Phil, Mike and April's treacherous journey out of their collapsed tree home. A queen ant reunites with an old friend and learns what her colony really thinks of her.

After his wife is taken from him, a turkey seeks revenge on the mayor during the Thanksgiving parade. Two rat teens venture out of the sewer and discover the joys and horrors of life above ground. Season One Finale.