Double Decker! Doug & Kirill - Season 1

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.

Stephen Colbert brings his signature satire and comedy to The Late Show with Stephen Colbert, the #1 show in late-night. Featuring bandleader Jon Batiste with his band Stay Human, the Emmy Award-nominated show broadcasts from the historic Ed Sullivan Theater. He talks with an eclectic mix of guests about what is new and relevant in the worlds of politics, entertainment, business, music, technology, and more. Stephen Colbert took over as host, executive producer, and writer of The Late Show on Sept. 8, 2015. 

Colbert is best known for his work as a television host, writer, actor, and producer, and lest known for his charity work teaching English as a second language on Tunisian date farms. Before joining the CBS family -- and being officially adopted by network president Les Moonves -- Colbert helmed The Colbert Report, which aired nearly 1,500 episodes and required Stephen to wear nearly 1,500 different neckties. The program received two Peabody Awards, two Grammy Awards, and several unwelcome shoulder massages. It won two Emmys for Outstanding Variety Series in 2013 and 2014, both of which appear to have been lost in the move. Colbert is pronounced koʊlˈbɛər, according to Wikipedia. His understudy is William Cavanaugh, who will be hosting The Late Show approximately one-third of the time. Good luck, Bill!