National Geographic: Inside Sumo's Ultimate Clash

Ten of Muhammad Ali's former rivals pay tribute to the three-time world heavyweight champion.

Jackie Chan is one of the world's biggest action stars, famed for his wacky sense of humor, remarkable martial arts techniques, and willingness to perform incredible stunts without the use of doubles -- or a net. This video takes a personal look at Chan as he works on screen projects in Hollywood and Beijing and candidly discusses his life and work.

In an ancient sport traditionally reserved for men, 20-year-old female sumo prodigy Hiyori attempts to revolutionize Japan’s national pastime.

The Official Golden Harvest tribute to the Master of the Martial Arts Film, Bruce Lee.

In this documentary, recovering addict and amputee John Wood finds himself in a stranger-than-fiction battle to reclaim his mummified leg from Southern entrepreneur Shannon Whisnant, who found it in a grill he bought at an auction and believes it therefore to be his rightful property.

A documentary focused on plastic pollution in the world's oceans.

The life of Mr. Spock, as well as that of Leonard Nimoy, the actor who played him for almost fifty years, written and directed by his son: Adam.

A heartfelt documentary focusing on the day-to-day lives of professional wrestlers, some on the rise, some on the wane, and others fighting for their lives.

A detailing of the rise to prominence and global sporting superstardom of six supremely talented young Manchester United football players (David Beckham, Nicky Butt, Ryan Giggs, Paul Scholes, Phil and Gary Neville). The film covers the period 1992-1999, culminating in Manchester United's European Cup triumph.

JB Smoove and Martin Starr host a celebration of 20 years of "Spider-Man" movies, from the Sam Raimi trilogy to Marc Webb's movies and the trio from Jon Watts.

This compelling Documentary moves beyond the spotlight and past the attention-grabbing headlines to give pop superstar Chris Brown a chance to tell his own story. New interviews with the international phenomenon reveal long-awaited answers about his passion for making music, his tumultuous and much publicized relationships, and the pitfalls of coming of age in the public eye. Also included is new concert footage, behind-the-scenes access, and special interviews from Usher, Jennifer Lopez, DJ Khaled, Mike Tyson, Jamie Foxx and others.

A documentary detailing the epic Rogues' Gallery of DC Comics from The Joker and Lex Luthor, Sinestro, Darkseid and more, this documentary will explore the Super Villains of DC Comics.

A comedic, brutally honest documentary following self-destructive TV writer Dan Harmon as he takes his live podcast on a national tour.

Daniel Craig candidly reflects on his 15 year adventure as James Bond. Including never-before-seen archival footage from Casino Royale to the upcoming 25th film No Time To Die, Craig shares his personal memories in conversation with 007 producers, Michael G Wilson and Barbara Broccoli.

Amateur and professional bodybuilders prepare for the 1975 Mr. Olympia and Mr. Universe contests as five-time champion Arnold Schwarzenegger defends his Mr. Olympia title against Serge Nubret and the shy young Lou Ferrigno.

Bruce Lee is universally recognized as the pioneer who elevated martial arts in film to an art form, and this documentary will reveal why Bruce Lee's flame burns brighter now than the day he died over three decades ago. The greatest martial artists, athletes, actors, directors, and producers in the entertainment business today will share their feelings about the one who started it all. We will interview the people whose lives, careers, and belief systems were forever altered by the legendary "Father of Martial Arts Cinema". Rarely seen archival footage and classic photos will punctuate the personal testimonials. Prepare to be inspired.

Unprecedented access to Muhammad Ali's personal archive of "audio journals" as well as interviews and testimonials from his inner circle of family and friends are used to tell the legend's life story.

Join the likes of Jeremy Renner, Hailee Steinfeld, Florence Pugh, and Vincent D’Onofrio as they reveal how Marvel Studios’ “Hawkeye” was conceived and created. Witness firsthand what it took to pull off the show’s pulse-pounding action set pieces, and discover how iconic characters from the pages of Marvel Comics such as Kate Bishop were adapted and brought to life for the six-episode series.

Ronnie Coleman is known as "The King" and for good reason. He is the 8x Mr. Olympia champion in the world of bodybuilding - sharing the world record for most Olympia wins. Now retired, he has undergone over 6 surgeries leaving him unable to walk without crutches but his desire to train like a pro bodybuilder has not dissipated. Exploring the history of his career as a bodybuilding legend and following his journey to recovery; for the first time ever discover the true man behind The King.

Behind the scenes look at fight choreography and action training.