Pirates of the Caribbean: On Stranger Tides is a 2011 American fantasy swashbuckler film, the fourth installment in the Pirates of the Caribbean film series and the sequel to At World's End (2007). It is the first film in the series not to be directed by Gore Verbinski, being replaced by Rob Marshall. Jerry Bruckheimer again served as producer. The film is technically a stand-alone sequel to the previous installments. In the film, which draws its plot loosely from the novel On Stranger Tides by Tim Powers, Captain Jack Sparrow is joined by Angelica in his search for the Fountain of Youth, confronting the infamous pirate Blackbeard. The film was produced by Walt Disney Pictures and released in the United States on May 20, 2011. It was the first film in the series to be released in the Disney Digital 3-D and IMAX 3D formats.