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To kick off the competition, teachers and nurses square off against four mighty hamsters before one team takes on Shadow in the final.

In three all-new challenges, the Trivia Kings and Volunteer Queens take on hamsters Astro, Lightning, and Romeo, as well as returning favorite Kevin.

The Weekend Warriors and Theater Kids get the first look at challenge Wiener Takes All before Astro tries to take all in the final.

Lawyers and Wrestlers step into the ring -- or wheel -- against familiar foes and the newest furriest competitor, The Professor.

Facing off against firefighters from Rhode Island and New Jersey, the Ham-stars look to snuff out the competition in an a-maze-ing new challenge.

Dancers and Magicians take center stage in another new feat before Lightning attempts to steal the spotlight in Escape the Cage.

Flight Attendants and Tooth Fairies try to take a bite out of the competition in a new challenge that tests an essential hamster skill: tunneling.

In this holiday showdown, with the humans ahead 4-3, the Caroling Elves and Christmas Candy Clerks hope to prove species superiority once and for all.