Lil Huddy

As the final four inch closer to winning the Nation's Dumbest trophy, the dumb answers continue, and the celebrities wonder whether it was actually a good idea to come on this show.

Family members come to witness their loved ones' intellectual demise.

Twelve celebrities report for their first day of class, tackling a logic challenge, a nostalgic quiz on grade-school subjects, and interactive zoology and geography tests as they work their way toward the high-stakes final exam.

The last two celebrities go head-to-head, each one desperate to avoid being crowned The Nation's Dumbest.

With only nine contestants remaining, tensions rise and rivalries start to form as the celebrities push themselves to their limits, tackling everything from general knowledge trivia to a game of life-sized human labyrinth.

Bonds are tested as the remaining five celebrities battle science, and each other, with explosive results.