The Master tells the story of a charismatic intellectual (Philip Seymour Hoffman) who creates his own faith-based organizations, and a traumatized World War II veteran (Joaquin Phoenix) who becomes his right-hand man.
The 1950s-set drama, directed by Paul Thomas Anderson, is believed to be influenced by the life story of Scientology founder L Ron Hubbard.
"It's not the L Ron Hubbard story... [Scientology] was one of the bigger movements at the time, but there were a lot of movements at that time. There's nothing about how I'm behaving or talking that echoes [Hubbard]," Hoffman told Entertainment Weekly.
"I thought of a lot of other bigger-than-life personalities, charismatic people like Orson Welles."
"People are going to have to draw their own conclusions to that aspect of the movie... [Anderson] is interested in how veterans came back from World War II," Sellar shared. "They were these lost souls who were uncertain about their future."
Amy Adams, Laura Dern and Jesse Plemons also star in The Master, which opens on September 14 in the US and on November 9 in the UK.
Watch a trailer for The Master below: