Laboratory rats Mike and Phil enter a love triangle with an imaginary friend; two fleas ponder life while stuck on a monkey's back; an algae questions its existence.

A teenage pigeon's jealousy over his angelic little brother leads him on a wacky spirit quest that teaches him about courage and responsibility; two foxes rap about their tough life on the city streets.

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

With New York City quarantined and in disarray, squirrels Mike and Phil prepare for their mother's remarriage. As Mike tries to impress a female guest, Phil plots to stop the wedding, squaring off with his soon-to-be little brother, the attention-hog Mason.

Inside the headquarters of evil conglomerate Pesci Co., the unscrupulous Dr. Labcoat prepares for the roll out of the 'Green Pill,' a mysterious cure for the virus plaguing New York City.

Rat teens Mike and Phil plot to exploit a human baby for profit, but things take a dark turn as the stakes increase; two bees fight over the love of a tulip.

As rival alley-cat crews face off for control of the streets of Little Italy, a young feline rises to the top of the pack; three owls gather for Christmas celebrations.

The power struggle among New York's feline gangs continues; Phil takes charge while Mike looks for a way out.

Two ends of a worm seek love and independence; newly hatched bluebirds fight to survive; an opossum and his father clash over the reality of being predators.

An elderly dog looks back on her life and dispenses wise advice; rat teens Phil and Mike wonder what the future holds.