A Black Mass is a ceremony supposedly celebrated during the Witches' Sabbath, which was a sacrilegious parody of the Catholic Mass. Its main objective was the profanation of the host, although there is no agreement among authors on how hosts were obtained or profaned; the most common idea is that they were profaned by means of some ritual related to sexual practices. Authors also disagree on which rites were performed during the ceremony. Some medieval writers believed that the host was replaced by a toad, a turnip or a piece of dry flesh, but most judges and authors believed that true hosts were given by Christian priests, who had made diabolical pacts, to the attendants of the Sabbath to be profaned by them.

It is not clear if the Black Mass was ever celebrated in medieval times; the works referring to them are lurid and unreliable sources such as the Malleus Maleficarum, and it may have served solely as a shocking act with which to accuse enemies.

One recent outline of the history of the Black Mass can be found in Richard Cavendish, The Black Arts (1967) in the section on the Black Mass. Before that, an entire book was written about it, The Satanic Mass, by H.T.F. Rhodes (1954). Additionally, a detailed study was published in German (and since translated into English) by Gerhard Zacharias, The Dark God: Satan Worship and Black Masses (1964).

John Christopher "Johnny" Depp II (born June 9, 1963) is an American actor, producer and musician. He has won the Golden Globe Award and Screen Actors Guild award for Best Actor. Depp rose to prominence on the 1980s television series 21 Jump Street, becoming a teen idol. Dissatisfied with that status, Depp turned to film for more challenging roles; he played the title character of Edward Scissorhands (1990) and later found box office success in films such as Sleepy Hollow (1999), Charlie and the Chocolate Factory (2005), Rango (2011) and the Pirates of the Caribbean film series (2003–present). He has collaborated with director and friend Tim Burton in eight films, most recently with Dark Shadows (2012).

Depp has gained acclaim for his portrayals of people such as Ed Wood, in Ed Wood, Joseph D. Pistone in Donnie Brasco, Hunter S. Thompson in Fear and Loathing in Las Vegas, George Jung in Blow, and the bank robber John Dillinger in Michael Mann's Public Enemies. Films featuring Depp have grossed over $3.1 billion at the United States box office and over $7.6 billion worldwide. He has been nominated for top awards many times, winning the Best Actor Awards from the Golden Globes for Sweeney Todd: The Demon Barber of Fleet Street and from the Screen Actors Guild for Pirates of the Caribbean: The Curse of the Black Pearl. He also has garnered a sex symbol status in American cinema, being twice named as the "Sexiest Man Alive" by People magazine in 2003 and 2009. He has been listed in the 2012 Guinness Book of World Records as the highest paid actor, with $75 million.

Benedict Timothy Carlton Cumberbatch (born 19 July 1976) is an English film, television, radio and theatre actor. His most acclaimed roles include Stephen Hawking in the BBC drama Hawking (2004); William Pitt in the historical film Amazing Grace (2006); the protagonist Stephen Ezard in the miniseries thriller The Last Enemy (2008); Paul Marshall in Atonement (2007); Bernard in Small Island (2009); Sherlock Holmes in the modern BBC adaptation series Sherlock (2010); and Peter Guillam in the spy thriller Tinker Tailor Soldier Spy (2011).

In February 2011, he began playing both Victor Frankenstein and his creature opposite Jonny Lee Miller in Danny Boyle's stage adaptation of Mary Shelley's Frankenstein. The play had a three-month run at the National Theatre. In late 2011, he played Major Stewart in Steven Spielberg's War Horse (2011). The film received five BAFTA nominations and six Academy Award nominations, including the Best Picture nomination in 2012. He also played Peter Guillam, one of the pivotal roles in Tomas Alfredson's Tinker, Tailor, Soldier, Spy (2011), which was nominated for three Academy Awards and 11 BAFTA Awards. Tinker Tailor Soldier Spy was also nominated for Best Picture in 2012.