Danny Lee "Nitro" Clark (born May 21, 1964) is a professional athlete, television personality, author, actor, and producer. He is best known for his role as gladiator Nitro on the TV show American Gladiators. He is also an in demand health and fitness expert and the creator of the "Gladiator Rock'n Run". Dan makes a guest appearance on Married... with Children as Biff, a parachute diving instructor, in the Season 6 episode "The Mystery of Skull Island".


Danny began his career as an athlete, playing football for San Jose State University, where he was a standout defensive lineman. Clark was also a member of Sigma Alpha Epsilon Fraternity. He then went on to play briefly for th Los Angeles Rams of the NFL, and in the Professional European League.

Danny, who's also a health and fitness expert, is best known from the game show American Gladiators, having worked on both the original version and the revival; from 1989–92, and again in 1994-95, he was the gladiator Nitro; during the original show's final season, he was the analyst and co-host for the show. In the 2008 revival, he is the coordinating producer for the show. The original series aired in over 40 countries, with reruns on USA NetworkTNTSpike, and airs currently ESPN Classic. The revival aired on NBC.

When American Gladiators returned to the U.S. airwaves on ESPN Classic on April 1, 2007, the network aired a marathon of episodes. Clark was the on-air host for that marathon, telling behind-the-scenes stories and trivia about the series in between the episodes. Clark also conducted an ESPN chat session related with the show and was one of the producers of the revamped "American Gladiator" on NBC that debuted to over 40 million viewers in 2010 making it one of the highest rated debuts of the season.

After American Gladiators, Clark turned to acting, appearing in such motion pictures as Death Becomes Her, with Meryl Streep, Bruce Willis, and Goldie Hawn; andEquilibrium, with Christian Bale. He has also guest starred in TV series including EllenWalker, Texas Ranger, California Dreams, V.I.P.Who's the Boss?Saved by the Bell, and The Brothers Garcia.

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