On Sunday, HBO's explosive new documentary on Scientology, "Going Clear," premiered on HBO.
The Alex Gibney-directed documentary is based on author Lawrence Wright's controversial book "Going Clear: Scientology, Hollywood, & the Prison of Belief," which grew out of a New Yorker profile on former Scientologist, director Paul Haggis.
In the doc, Gibney takes aim at Scientology's most high profile members, like Tom Cruise and John Travolta, and addresses why the actors would have such a hard time leaving the religion.
But Cruise and Travolta aren't the only celebrity Scientologists.
From "Mad Men" stars to "Orange Is The New Black" actors, see who else is part of the controversial religion.
With additional reporting by Ashley Lutz.
Actress Kirstie Alley
The former "Cheers" star says the religion helped her overcome a cocaine addiction.
"I think that probably all religions sound bizarre to the people who are not the practitioners of them," Alley says of Scientology. "To me it's so normal, and probably 90% of the crazy stuff I hear isn't true. I've been a Scientologist for over 30 years. I think a lot of things are sensationalized."
In 2010, rumors swirled her weight loss program, Organic Liaison, was a front for Scientology, a claim the actress vehemently denied.
Actor Danny Masterson
Masterson is best-known for his role on "That '70's Show." He defended Tom Cruise for the actor's leaked Scientology video back in 2008.
In an interview with Paper Magazine in 2009 he explained the religion as follows:
"The definition of Scientology is 'the study of knowledge,'" said Masterson. "Obviously, the more knowledge you have in a given field, such as life, the more confident you are as a person."
Actress Bijou Phillips
Indie actress Bijou Phillips, most recently known for her role on "Raising Hope," is daughter of the "Mamas and Papas" singer John Phillips.
Bijou is married to Danny Masterson and the two frequently go to Scientology events together.
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