Trivia: Actor Mark Harmon is the son of football great Tom Harmon and 1940s film star Elyse Knox; he is the brother of Kris Harmon -- ex-wife of Ricky Nelson -- and uncle of Kris and Ricky's actress daughter Tracy Nelson; and finally, Harmon is the husband of Mork and Mindy star Pam Dawber. Harmon emulated his dad by playing football at UCLA, then followed in mom's footsteps by turning to acting; his first movie was 1978's Comes a Horseman. Most of Harmon's starring film appearances are easy to take but unmemorable, such as his lackadaisical high-school teacher in Summer School (1988). A baseball fan, Harmon was once part-owner of the minor-league San Bernardino Spirit, a team which figured prominently in his 1988 film vehicle Stealing Home. Harmon is best known for his work on 1980s series TV: he has co-starred in Flamingo Road and Moonlighting, and played the lead role of AIDs-stricken Dr. Bob Calswell on St. Elsewhere. TV would prove to be a source of success for the actor, and he would go on to star on such popular shows as Chicago Hope and NCIS.

Trivia: Born in New York City on August 8th, 1968 and raised in Fairfield, CT, prolific film and television actor Michael Weatherly got his start on an episode of The Cosby Show before moving on to carve out an impressive career on screens both large and small. While many television viewers would recognize Weatherly from walk-on roles in such popular television series as Charmed and Ally McBeal, it was the actor's controversial age-disparity romance with Dark Angel co-star Jessica Alba that got tongues wagging around Tinseltown back in 2001. He could be seen opposite Alba on that sci-fi program throughout its two-season run (2000-2001). Later, Weatherly portrayed actor Robert Wagner in the made-for-television drama The Mystery of Natalie Wood before revealing a deeply personal secret about his onscreen girlfriend in Her Minor Thing. In 2003, Weatherly landed his most regular television role to date, as a Naval criminal investigator on NCIS.

Trivia: David McCallum's parents were both members of the London Philharmonic; his mother was a cellist and his father was first violinist. The young Scots-born McCallum himself planned to pursue a musical career after serving with the Royal West African Frontier Force, but decided instead upon acting. Following his studies at the RADA, McCallum entered films in 1957, where he was usually cast as a troublemaking street punk or callow junior officer. His first American film (albeit lensed principally in England) was Freud (1962), in which he played a profoundly mother-obsessed mental patient. McCallum became the rage of the teeny-bopper set when he was cast as cool-headed Russian secret agent Ilya Kuryakin on TV's The Man From UNCLE (1964-68). At one point, McCallum was receiving far more fan mail than the series' ostensible star, Robert Vaughn; he took advantage of his celebrity to launch a brief singing career, duetting with Nancy Sinatra on the 1966 UNCLE episode "The Take Me to Your Leader Affair." He also wrote the music and lyrics and sang the title song of his 1967 movie vehicle Three Bites of the Apple. Following UNCLE, McCallum had a handful of solid dramatic film roles before returning to the small screen in the short-lived 1975 series The Invisible Man. He continued to appear primarily in episodic television, although he occasionally could be glimpsed on the big-screen as well. Highlights include The Watcher in the Woods, Matlock, The Wind, Murder She Wrote, and The A-Team. The nineties began with a major part in the sleeper Hear My Song, before continuing in Healer, Law and Order, and Cherry. McCallum became a fixture on television yet again at the beginning of the 21st century when he was cast as Donald "Ducky" Mallard on CBS' drama NCIS, which was for a time the top-rated scripted drama on network television.A man of sundry outside interests, McCallum's range of expertise includes computers and small-arms weaponry. Once wed to actress Jill Ireland, David McCallum has since 1967 been married to Katherine Carpenter.

Trivia: Going under the name Pauley P., actress Pauley Perrette (born March 27th, 1969) first gained notoriety with an extended arc on the acclaimed ABC drama Murder One. She followed that with guest spots on such shows as The Drew Carey Show and Frasier before landing a gig as a regular (using her full moniker) on the short-lived Party of Five spin-off Time of Your Life. After that series bowed, Perrette could be seen in small capacity in the big-screen hits Almost Famous and The Ring. In 2003, she finally landed in a series with staying power. This time it was the JAG spin-off Navy NCIS, a CBS drama that cast Perrette in a lead role alongside Mark Harmon.

Trivia: Actor Sean Murray began filling up his resumé when he was just a young teenager, making small appearances in movies like Hocus Pocus and This Boy's Life. He continued to steadily wrack up small and midsized roles in films and on television until 2004, when he joined the cast of the series NCIS playing Timothy McGee. His stepsister, Troian Bellisario, has appeared in NCIS as Murray's character's sister.

Trivia: American actress Lauren Holly has herself admitted that turning down the female lead in the Jim Carrey vehicle Ace Ventura, Pet Detective (1994) may not have been the wisest career move. Holly was acting on instinct, having co-starred with another highly individual comedian, Andrew Dice Clay, in 1990's forgettable The Adventures of Ford Fairlane. But when profits from Ace Ventura soared, Lauren was more than willing to sign on for the subsequent Carrey vehicle, Dumb and Dumber (1995), during the filming of which she and Carrey became an item. The actress has kept busy ever since her first important TV role as Betty in Archie: To Riverdale and Back Again (1990) and a stint on the ABC soap opera All My Children. Prior to her recent film success, Holly was perhaps best known for her role as Deputy Maxine Stewart on the CBS drama Picket Fences .In 1995 the actress played a doctor in Sydney Pollack's remake of Sabrina, and went a different direction in 1996's comedy Down Periscope, in which she played Lieutenant Emily Lake. Holly took on a supporting role in Any Given Sunday (1999), a rousing sports drama from director Oliver Stone, and joined Mel Gibson and Helen Hunt to play a supporting role in 2000's romantic comedy What Women Want. The following year Holly would voice Chihiro's mother in the US rerelease of the acclaimed anime fantasy Spirited Away the following year, and from 2005 until 2008 became known for her role as Director Jenny Shepard on CBS' long-running police procedural NCIS. Holly voiced the character of Haulie on the Adventures of Chuck & Friends, an animated series for children in 2010, and continues to be active in film and television.

Trivia: Born in Chile but raised in Miami, actress Cote de Pablo developed an impressive resumé on both stage and screen. In 2001, she appeared in a New York City Public Theater production of Measure for Measure, and in 2005, she made her Broadway debut in The Mambo Kings. In 2006, she joined the cast of the series NCIS, playing Mossad operative Ziva David. She made her big-screen in the western The Last Rites of Ransom Pride.

Trivia: Was raised in Williamstown, Massachusetts.Played Soccer in college.Made his debut in Television in 1998.Met his wife, Lesley-Ann Brandt, in an acting studio after they got assigned a scene together, and have been together ever since. Is an animal lover. Is involved with NKLA, a non-profit organization in Los Angeles that rescues pets from shelters.

Trivia: A graduate of the famous School for the Performing Arts, actor Rocky Carroll continued his studies at the Conservatory of Theatre Arts at Webster University before moving to New York in the mid-'80s to try his hand at a professional acting career. He soon found success with the Shakespeare on Broadway series, and cultivated a flourishing career on-stage. Carroll also branched into screen acting, with recurring roles on Roc and Chicago Hope, and in movies like Crimson Tide, Born on the Fourth of July, and Yes Man.

Trivia: A graduate of Colorado's Niwot High School, actor Brian Dietzen gravitated to drama at eight years old, when he caught the acting bug from an elementary school play; in time, he extended his stage activities into high-school productions, and attended the University of Colorado at Boulder as a theater major in that institution's B.F.A. program. Under the mentorship of Sean Kelley, Dietzen formally trained in theatrical mainstays -- from Waiting for Godot to Equus; so successful were his efforts in these productions that it prompted him to join the Colorado Shakespeare Festival after graduation, and then to make the big leap to Los Angeles. Dietzen scored his first major coup in L.A. by signing on for a regular role in the short-lived WB series My Guide to Becoming a Rock Star, and then landed a small part in the American Idol spin-off movie From Justin to Kelly (2003). The actor is best known, however, for his recurring series role as Jimmy Palmer, assistant lab technician to Donald "Ducky" Mallard (David McCallum), on the popular CBS procedural thriller NCIS. On the side, he remained extremely active in stage work.

Trivia: Dropped out of college and took public speaking classes to help further her career. At the premiere of Gone (2012) she admitted she's always had a fear of being kidnapped. Was cast in NCIS in 2013 as a replacement for the departing Cote de Pablo; she was promoted to a series regular before her first episode aired.