How big a deal is "The Mormons" to PBS? The two-part, three-hour documentary scheduled to air next April will mark the first-ever collaboration between two of public broadcasting's big guns — the award-winning series "Frontline" and "American Experience."

"It will be a very big deal for us," said new PBS president and CEO Paula Kerger.

"The Mormons" (a working title that may change) will air Part 1 on a Monday night as that week's installment of "American Experience"; Part 2 will air a day later as that week's installment of "Frontline."

"It's a look at one of the fastest-growing and most influential religions," said John Wilson, PBS's senior vice-president of programming.

Details are sketchy at this point, but the "American Experience" segment of the program is expected to deal with the history of The Church of Jesus Christ of Latter-day Saints, while the "Frontline" installment is expected to deal more with the contemporary church and its influence in Utah, the United States and the world.