In 1888, Owney, a stray terrier puppy, finds a home in the Albany, New York, post office and becomes its official mascot as he rides the mail train through the Adirondacks and beyond, criss-crossing the United States, into Canada and Mexico, and eventually traveling around the world by mail boat in 132 days.

Cousins Mike and Kate must help the Philadelphia Phillies' mascot, the Phillie Phanatic, clear his name after the team's bats begin to suspiciously break during games.

Quick-thinking third-graders Lizzy, her twin, Connor, and their friends Kym and Deon have a big idea: their school desperately needs a new mascot, and they've got the perfect one in mind. Now they have to figure out a way to convince their principal and rally the rest of the school behind them. Luckily, their teacher, Miss Zips (short for Zipsokowski-but who can say that?) is skilled in the art of persuasion. Armed with Miss Zips's persuasive tips,...

Fed up with their sports-obsessed school, seventh-grade playwright Olive and her best friend Reynaldo decide to kidnap the school's capybara mascot in an attempt to get more benefits and respect for non-athletes.