Reality stars, actors looking to make a comeback, one inspirational feel-good story – yes, it’s the cast of the upcoming season of “Dancing With the Stars.”

The big story of the year is actress Valerie Harper, who was diagnosed earlier this year with terminal cancer, but revealed Wednesday on “Good Morning America’s” casting announcement that doctors cleared her to dance in the competition.

“The brain scans you get every two months are looking better and better and better,” said Harper, adding that her doctors are “delighted” she’s moving in the right direction.

Other big names include recent Scientology-denouncing actress Leah Remini, who looked exhausted appearing via satellite from ABC’s Los Angeles bureau; Elizabeth Berkley, of “Saved by the Bell” and “Showgirls” fame; reality star Jack Osbourne, whose sister, Kelly, previously danced on the show; and, the “Jersey Shore” reign continues with Snooki joining the cast. Plus, a handful of Disney family stars, such as “Pretty Little Liars” actor Brant Daugherty (Noel Kahn) and former “High School Musical” singer/dancer Corbin Bleu.

Meanwhile, the biggest surprise? Children’s TV host Bill Nye the Science Guy, whose show had the catchiest theme song of all time.

Dancing is “all physics, it’s all the study of motion,” he explained to the “GMA” hosts, about why he might have an advantage in the competition.

Here’s the entire cast, along with their professional dance partners; Season 17 of “Dancing With the Stars” debuts Sept. 23.

Nicole “Snooki” Polizzi, of “Jersey Shore” (Sasha Farber)

Valerie Harper, actress from “Mary Tyler Moore Show” (Tristan MacManus)

Keyshawn Johnson, NFL wide receiver (Sharna Burgess)

Brant Daugherty, actor of ABC Family’s “Pretty Little Liars” (Peta Murgatroyd)

Christina Milian, actress/singer/songwriter (Mark Ballas)

Bill Nye the Science Guy, children’s TV show host (Tyne Stecklein)

Elizabeth Berkley, actress from “Saved by the Bell” and “Showgirls” (Val Cherkovskiy)

Corbin Bleu, actor from “High School Musical” (Karina Smirnoff)

Amber Riley, actress/singer from “Glee” (Derek Hough)

Bill Engvall, comedian (Emma Slater)

Jack Osbourne, reality star (Cheryl Burke)

Leah Remini, actress from “King of Queens” (Tony Dovolani)