Leah Remini Rips 'Overgrown Child' Tom Cruise, Reveals His Secret Feud With John Travolta

When Tom Cruise chose fellow Scientologist Leah Remini to be his friend more than a decade ago, the actress was forced to hide his most shocking secrets and bizarre behavior. But two years after escaping the church, she's coming clean in her upcoming memoir, Troublemaker— and RadarOnline.com can exclusively reveal her crazy but true stories about Cruise.

After years in Scientology, Remini, now 45, says she was welcomed to join Cruise's church entourage, which also included "heavy-contributing" Hollywood members Marisol Nichols, Ethan Suplee and Jenna and Bodhi Elfman.

Despite being high-profile members of the church, Kirstie Alley and John Travolta were not welcomed into his clique, she reveals. "I had heard that Tom didn't like them," Remini writes.

Don't refuse Cruise! The actor's personal Scientology handler, Tommy Davis, ordered Remini and her husband Angelo Pagan to teach Cruise salsa dancing lessons in a last minute obligatory invitation to his Beverly Hills mansion. When they arrived, Cruise surprised Remini by bringing actress Katie Holmes along for the lesson. (Their relationship was still a secret.) Two Scientology handlers watched their every move, adding to a "weird feeling" Remini says she felt from the visit.

How old is he? As she got to know Cruise, now 53, she says she felt like he was a "big kid" with "goofy ideas of fun." One night, he decided the group, which also included Jada Pinkett Smith, would play hide-and-seek in his 7,000-square-foot house.

Deranged tyrant! Remini says she once witnessed Cruise berate a female assistant when he thought she hadn't properly prepared cookie dough for the group to bake. "Get in the f***ing present time, is what you need to do!" she claimed he screamed, adding that the assistant was beneath late Scientology founder L. Rob Hubbard, church leader David Misgivage and himself. Turns out, the cookie dough was under his nose the entire time. "It was horrible to watch someone I admired come undone, and even worse to witness the fear in the assistant's eyes," Remini recalls.

In another shocking incident, an assistant handed Cruise a chipped coffee mug, which lead him to spin into an epic tantrum. "You served me tea in a chipped mug? Do you know who gets served with a mug that's chipped? F***ing DBs," she claims he said, referring to "Degraded Being," a derogatory term.

Scientology's prestigious Sea Org members were constantly "hovering" around Cruise's home, Remini claims. "It was to make sure nothing upset Tom, and if it did, to immediately report it to the church, specifically to David Miscavige."

Cruise's power in the church terrified Remini. "I had seen behind the curtain. There, in the role of the great and powerful Oz, was not L. Ron Hubbard, as I had come to believe, but instead, it seemed to be Tom Cruise," she writes. "Was my church falling apart? Was Tom in charge?"

After three months together, Remini writes, Boniadi was unceremoniously dumped by Cruise. She talked about the strange experience with a friend, who tattled on her and told church leaders. Boniadi was punished with four months of menial labor, including cleaning toilets with a toothbrush, and wasn't allowed to talk to anyone.

Just months later, Cruise was engaged to Holmes. Boniadi and her family left Scientology, disgusted with the church's actions during the girlfriend grooming stages. "Naz had been manipulated and lied to, all in an effort to keep Tom Cruise happy," Remini writes. "For him to have dismissed her without saying goodbye or speaking directly to her seemed beyond cruel."