Disney 100: A Century of Dreams – A Special Edition of 20/20

Stars celebrate Bob Hope's 50 years with NBC.

Sir Tony Robinson takes a journey back in time to find out where Blackadder really began, and to uncover the story of the previously-unseen pilot episode.

A posthumous tribute to comedy legend Lucille Ball by her frequent co-star Bob Hope features clips from many of their sketches and tributes from George Burns, Danny Thomas, Kirk Cameron, and Betty White.

Hundreds of great white sharks have recently appeared on the doorstep of one of America’s most popular tourist destinations, hunting in ways never documented before. To understand why the sharks are here and what this means for Cape Cod, a team of scientists are studying this new phenomenon to try to keep people safe. Are the sharks changing the natural ecosystem … or restoring it?

Sylvester Stallone and John G. Avildsen narrate behind-the-scenes footage from the making of "Rocky" to mark the film's 40th anniversary.

Illusionist Derren Brown reinvents the concept of "faith healing" through a series of stunts that debunk the confines of fear, pain and disbelief.

Maybe the 25th anniversary year didn't go *quite* as planned but we were still able to come together for a look back at the last 25 years.

A special celebrating FOX's 25 years on the air. Highlights from iconic series and tributes to memorable moments, as well as celebrities honoring the network include.

Freddy Krueger hosts a retrospective special/making-of "Freddy's Dead."

For more than a half-century, Sesame Street has addressed and explained diversity, equity, and inclusion around the globe by using the universal tools of music, empathy and celebrity. Sesame Street: 50 Years of Sunny Days reflects upon the efforts that have earned the show respect and qualification around the globe. The special also chronicles the creation and introduction of a Black family of Sesame Street Muppets, Wes and Elijah Walker, a father-and-son duo who are at the heart of Sesame Workshop’s new racial justice initiative Coming Together.

"What would the world be like without Beethoven?" That’s the provocative question posed by this music documentary from Deutsche Welle. To answer it, the film explores how Ludwig van Beethoven's innovations continue to have an impact far beyond the boundaries of classical music, 250 years after his birth.