Substitute Host

Chef Anne Burrell is back for a seventh season of trying to turn some of America's worst cooks into kitchen stars. This time, however, the recruits are seven celebrities who can showcase their talents on TV and in movies, but not no so much in the kitchen. Burrell competes against Worst Cooks in America newcomer Rachael Ray to see which chef can lead one contestant to make the most impressive culinary transformation. Actors Dean Cain, Ellen Cleghorne, Jaleel White and Barry Williams join reality stars Jenni "JWoww" Farley, Chris Soules and Kendra Wilkinson in boot camp. The winning star gets $50,000 for charity and bragging rights for his or her mentor. Not all of the celebrities will make the cut, however; after an opening potluck dinner each mentor selects three recruits to be on her team, leaving one celebrity to be sent home before the competition really begins. Burrell is looking to extend her record to 5-2, while Ray looks to get the win in her first season.

The Challenge: All Stars features twenty-two of the most iconic, boldest, and fiercest Challenge All Stars from the original Real World and Road Rules, returning for a chance at the ultimate competition as they vie for their shot at the $500,000 grand prize.

Emmy Award and Grammy Award winner Jimmy Fallon brought NBC's "The Tonight Show" back to its New York origins when he launched The Tonight Show Starring Jimmy Fallon from Rockefeller Center. Fallon puts his own stamp on the storied NBC late-night franchise with his unique comedic wit, on-point pop culture awareness, welcoming style and impeccable taste in music with the award-winning house band, The Roots.

Seth Meyers, who is Saturday Night Live's longest serving anchor on the show's wildly popular "Weekend Update," takes over as host of NBC's Late Night — home to A-list celebrity guests, memorable comedy and the best in musical talent.

As the Emmy Award-winning head writer for "SNL," Meyers has established a reputation for sharp wit and perfectly timed comedy, and has gained fame for his spot-on jokes and satire. Meyers takes his departure from "SNL" to his new post at "Late Night," as Jimmy Fallon moves to The Tonight Show.

Some of the world's most incredible engineering projects now lie in ruins. These deserted places are home to extraordinary mysteries and untold secrets, and we revisit them to understand how they were built, and why they were abandoned.

They were once some of the most advanced structures and facilities on the planet, standing at the cutting-edge of design and construction. Today they are abandoned, dangerous, some of them even deadly. From uninhabited cities to empty factories, these long-forgotten engineering marvels are scattered around the globe. Science Channel uncovers why some of the world's most advanced architectural achievements were eventually left behind in the all-new series Mysteries of the Abandoned.

Each of the six, hour-long episodes of Mysteries of the Abandoned features stories behind engineering wonders, why they were built, and the reasons they were eventually left to crumble. Each story recalls the people who originally designed the structure, their historical significance, and why they were ultimately no longer of use. The premiere episode explores California's Goat Canyon Trestle railway, known as the 'Impossible Railroad,' that required the biggest wooden trestle bridge in the world; Ukraine's Duga, the notorious anti-ballistic missile radar, known as the 'Russian Woodpecker,' that still stands in within the Chernobyl Exclusion Zone; and the Grand Goulets Road in the French Alps, an astonishingly narrow and perilous mountain passageway.