Transcript for Leah Remini on Why She Made Her 'Scientology and the Aftermath' Series
mez. Gomez.member of scientology since he was a teenager. Since breaking with the church she's been warning others to stay away and sharing her stories from the inside. Here's Dan Harris. Impl going to tell these stories in hopes that people wake up and go, okay, somebody needs to do something about this. Reporter: Leah remini, a small screen star with a large personality, says she's now on a mission to expose the inner workings of the religion in which she was raised. I'm not going to be intimidated. The church will get exposed, and I'm not going to stop. Reporter: Remny's running battle with the church of scientology reaching a whole new level this week with the airing of the first episode of her documentary, Leah remini, scientology and the aftermath. She follows other former members of the church and tells their story. I hope that this project at least validates your pain is real. Reporter: Her public feud with scientology began in 2013 when she quit the church and escalated last year with the release of her book "Troublemaker" where she described her life within scientology. The church said the book was a pathetic quest to get publicity. As for her new show, the church says it's full of lies and doomed to be a cheap reality TV show, saying it is sad that Leah remini wishes to exploit for money those who tirelessly worked to help her when no one else was willing to tolerate her behavior. Adding she needs to stop blaming the church. She needs to move on with her life instead of pathetically exploiting her former religion, her former friends and other celebrities for money. Reporter: She is now demanding $1.5 million from the church for what she tells the Hollywood reporter is a response to the horrific and letters they sent about me. They were trying to stop the show from happening. They were trying to disparage my name. When you start plp blp with peoples lives and families, I'll stop too. Reporter: I sat down with her last year. She described the power and allure to the church for her when she joined as a child. Reporter: As a kid looking around and comparing herself to others N to be part of a faith where you had a mission to save -- The planet. Reporter: When she was a teenager her mom a devoted scientologist enrolled her in the uniform full-time religious order of the church. Leah and her family moved to the church's spiritual head quarters in clear water, Florida called the flag land base. They provide room and board and you work there and sign a billion year contract. Reporter: A billion year contract? Yes. Reporter: You as a child signed it? Correct. Reporter: Scientologists believe in reincarnation and expect people to keep working for the church after they come back. What kind of work were you doing? It could go from working in a laundry room to working industrial Sanders. Reporter: Industrial Sanders? Uh-huh. Reporter: The church says children are no longer admitted there. And Leah with us disz missed for her inability to maintain the ethical standards as far as from thatter in aization, and she petitioned to stay but failed. After she left she and her family stayed in the church and moved to Los Angeles, and that is where she launched her acting career scoring small roles in TV shows like "Cheers". You're pregnant. I am. Reporter: "Saved by the bell", and "NYPD blue". How helpful was scientology in terms of getting your acting career started? There are tools that are helpful to you in your life, to you as an actor. I walked into a room where some people might cower in front of a casting director, I wasn't. Reporter: That confidence paid off when she landed the role on "King of queens" which she says the church used as its advantage. Now not only am a celebrity but I've also become a leader in my church. Reporter: She first started to question scientologist in 2006 at the wedding of Tom Cruise and Katie Holmes. She was captured with Jennifer Lopez and mark Anthony. She says church officials to be their Tom Cruise to a level that made her uncomfortable. She also said there were efforts to separate her from Jennifer Lopez by having them travel in separate vehicles and sit at different tables. I could only assume because they wanted to make her a scientologist, maybe I was barring that road. Reporter: The church said in regards to the wedding every claim she has made is not only untrue but ridiculous and stupid. For her part, Leah says what she saw at that wedding was enough for her to take aed are Cal step. She says she filed a wide ranging internal report complaining about various scientologists at the wedding. Reporter: You left the wedding on a mission to save scientology? Right. I thought I now see where the cracks are in our church. Reporter: But to her dismay she arrived home and learned that numerous scientologists filed reports on her. That I had disrupted the wedding, and I basically destroyed the wedding. Reporter: She says she had crossed two pillars of scientology. Tom Cruz and the chairman of the board, and that she was now being taken to task. She says she was subjected to a series of expensive interrogations using church technology known as an E meter. She had to pay for the sessions herself, she says. Basically they were just trying to get me to recant what I said, to apologize for ruining the wedding of the century. Reporter: Why didn't you just leave? I wasn't ready to leave the church. Reporter: She remained for a time, but she says a process was set in motion leading her and her family to finally quit in 2013 and then to her writing her book, and now it all appears to be culminating in this new show on a and E which she hopes will provoke real change in scientology. This is Dan Harris in New York.
This transcript has been automatically generated and may not be 100% accurate.