CBS on Monday unveiled the latest batch of 16 castaways ready to battle it out for a million bucks in the granddaddy of reality TV's 12th edition, Survivor: Panama--Exile Island, set to premiere Feb. 2.

Along with the identities of the Gilligans, the network also announced some tweaks with the show's formula.

Newly reupped host Jeff Probst will kick off the 39-day contest by dividing the competitors into tribes of four, separated into the politically incorrect groupings of Older Men vs. Older Women vs. Younger Men vs. Younger Women. The four tribes will become two in a "schoolyard pick" during the second episode.

A hint to the season's most insidious new gimmick, though, has can be found in the show's Exile Island subtitle. Each episode, one castaway from the losing tribe will be banished to a separate island, several miles away from their group's encampment. While there, contestants will be forced to fend for themselves until being reunited with their tribe; however, there's a hidden immunity idol on the island. Should the banished castaway find it, that person can use the idol to save themselves at a future tribal council.

Among the latest castaways to be vying for immunity this season are some pretty heavy hitters, including 52-year-old retired astronaut Dan Barry from South Hadley, Massachusetts.

"I've had the opportunity to fly on three space shuttle missions, two to the International Space Station and, along the way, do four space walks," Barry said on CBS' Early Show Monday.

In the first episode, he'll be grouped with fellow "mature" tribe member Bruce Kanegai, a karate instructor from Simi Valley, California, who at age 58 is the show's oldest player.

"I want to be Mr. Miyagi," Kanegai said. "A survivor."

As for the young'uns, 32-year-old Bobby Mason, an attorney from Los Angeles, is coming at the game from a slightly less enlightened angle.

"I'm not like some pretty boy--soft, mushy, sensitive, caring, considerate dude," Mason said. "I'm basically a modern day caveman."

As for the women, South Carolina spawns two contestants this season, 35-year-old registered nurse Cirie Fields and 48-year-old shopping developer Ruth Marie Milliman.

Fields, for one, has her game plan in order.

"I want to be like the hot mama," she said. "I want to be the hot nurse. I want to be the hot cook. I just want to be hot, really."

On the opposite end of the women's spectrum is Tina Scheer, 45, a lumberjack who calls herself a "lumberjill."

"I'm a female in a male-dominated business," Scheer said. "And I have had to struggle a lot."

Here's a complete look at the contenders:

• Dan Barry, 52, retired astronaut from South Hadley, Massachusetts
• Aras Baskausas, 24, yoga instructor from Santa Monica
• Austin Carty, 24, author from High Point, North Carolina
• Terry Deitz, 46, retired Navy fighter pilot from Simsbury, Connecticut
• Danielle DiLorenzo, 24, medical sales representative from Pompano Beach, Florida
• Cirie Fields, 35, registered nurse from Waterboro, South Carolina
• Misty Giles, 24, engineer from Dallas
• Melinda Hyder, 32, singer from Sevierville, Texas
• Bruce Kanegai, 58, karate instructor from Simi Valley, California
• Courtney Marit, 31, performance artist from Los Angeles
• Bobby Mason, 32, attorney from Los Angeles
• Ruth Marie Milliman, 48, director of retail leasing from Greenville, South Carolina
• Shane Powers, 35, entertainment marketing company owner from Los Angeles
• Tina Scheer, 45, logging sports promoter/performer from Hayward, Wisconsin
• Sally Schumann, 27, social worker from Chicago
• Nick Stanbury, 25, financial sales rep from Tempe, Arizona