Over four episodes, the Houses of Hogwarts will battle to see which team knows the most about the wizarding world. Tonight’s match -- the Gryffindors face the Hufflepuffs. Dame Helen Mirren hosts.

Tonight's battle of the Hogwarts houses sees the wise and witty Ravenclaws go up against the proud and ambitious Slytherins. Tonight's match-up will take place under the watchful eye of the master of ceremonies, Dame Helen Mirren.

Dame Helen Mirren returns to the Wizarding World to oversee this wildcard match-up. In addition, there will be special celebrity guests, actors from the original films and more Harry Potter trivia than you could squeeze into a cupboard under the stairs.

Join Dame Helen Mirren for a historic night in history of Hogwarts as this epic TV event series culminates in the Grand Final. Tonight’s final edition is full of Wizarding World trivia, packed with magical special guests and overflowing with classic clips. It all comes down to this, one team, one house will tonight lift the inaugural Hogwarts Tournament of Houses trophy.