A co-production of the United States and the United Kingdom, The Dark Knight was released on July 18, 2008 in the United States and on July 25, 2008, in the United Kingdom. Film critics consider it one of the best films of the 2000s and one of the best superhero films ever; the film received highly positive reviews, particularly for its action, score, screenplay, performances (particularly Ledger's), visual effects, and direction, and set numerous records during its theatrical run. The Dark Knight appeared on more critics' top ten lists (287) than any other film of 2008 with the exception of WALL-E, and more critics (77) named The Dark Knight the best film released that year. With over $1 billion in revenue worldwide, it became the highest-grossing film of 2008 and is the 35th highest-grossing film of all time, unadjusted for inflation (4th at the time of release); it also set the record for highest-grossing domestic opening with $158 million, a record it held for three years. The film received eight Academy Award nominations; it won the award for Best Sound Editing and Ledger was posthumously awarded Best Supporting Actor. The Dark Knight Rises, the final film in the trilogy, was released on July 20, 2012.

Can we conclude that is there a sequel to the dark knight?
yes