Which subject will win Tom Gleeson's Big Brass Mug for its young expert contestant? Hamilton the musical, the Leadbeater's possum, Caterpillar earthmovers or Seinfeld?

Hard Quiz Kids! Tom Gleeson faces four young contestants foolish enough to try and win the Big Brass Mug with their expert subjects of capital cities, Hello Kitty, aviation disasters, and The Wizard of Oz.