Titanic is an American epic romance-disaster film that fictionalised the account of the sinking of the RMS Titanic. It stars Leonardo DiCaprio and Kate Winslet as members of different social classes who fall in love aboard the ship during its ill-fated maiden voyage. It was released in the UK on 23 January 1998. With an initial worldwide gross of over $1.84 billion, Titanic was the first film to reach the billion-dollar mark. It remained the highest-grossing film of all time until Avatar surpassed it in 2010. A 3D version was released on 4 April 2012 to commemorate the centennial of the sinking and in 2017 was re-released for its 20th anniversary and was selected for preservation in the United States National Film Registry.