|
Character Name |
Actor Name |
Location |
Character Description/History |
| Elise Hitchcock | Julie Bowen | Connecticut | equine veterinarian, horse breeder, Mark Hitchcock's wife |
| Megan Murtagh | Abigail Hawk | DC & DS | Jack and Eileen's daughter, head trainer for DS and DC racing |
| Patrick Murtagh | Chris Lowell | DC & DS | assistant trainer, DS and DC Racing |
| Ashleen Murphy Cullen | Margo Harshman | Diamond Shamrock Farm | Mike's wife, mother of Joe and Bridey, dies when Bridey is 14 |
| Bridget Cullen Murtagh Dietrich | Gail Strickland | Diamond Shamrock Farm | Queen Bridget the Great; mother of Jack, Lynn, Kevin, and Donnie |
| Gillian Murtagh Goddard, RN | Leslie Hendrix | Diamond Shamrock Farm | Lynn's aunt; nurse, photographer, dog breeder and handler |
| Hans Dietrich | Eric Braeden | Diamond Shamrock Farm | Bridey's second husband, father of her sons Jack and Donnie. Two-time Olympic gold medalist in Dressage. |
| Joe Cullen | Tim Daly | Diamond Shamrock Farm | USMC, MOH awardee, WWII, Pacific Theater; assistant trainer; Diamond Shamrock; later head trainer |
| Mike Cullen | Barnard Hughes | Diamond Shamrock Farm | father of Joe and Bridey, Hall of Fame horse trainer |
| Maura Murtagh | Elizbeth Moorehead | Diamonds South Farm | Jack and Eileen's daughter, manager of DS/DC breeding facility in Florida |
| Thomas Magnum | Tom Selleck | Hawaii/USN | former Seal, PI in Hawaii, later USN, ONI analyst, later DCNO |
| Angie Pierce | Judy Lang | NIMR | Nelson's AA, one of Lynn's best friends; married to Dennis Pierce |
| Bill Fletcher | Christian Clemonson | NIMR | computer designer, NIMR |
| Bob Shaughnessey, PhD | Terrence Knox | NIMR | cetacean researcher, NIMR |
| Bridey Murtagh | Joanna Garcia Swisher | NIMR | Jack and Eileen's middle daughter, later dolphin researcher, NIMR |
| Caitlynn Murtagh PhD | Brooke Langton | NIMR | Jack and Eileen's oldest daughter, PAO at NIMR, successful mystery/technothriller officer, doctorate in history |
| CPO Joe Bates | Mike Colter | NIMR | Leading CPO in NIMR Operations |
| CPO Augustus Sanchez | Hector Elizondo | NIMR | CPO, Operations |
| CPO Pete O'Reilly | Tom Berenger | NIMR | Leading CPO in NIMR Security |
| David Cousins, PhD | Denzel Washington | NIMR | dolphin researcher at NIMR |
| Donnie Murtagh | Patrick Wilson | NIMR | Lynn's youngest brother, Navy helo pilot, later at NIMR as helo pilot |
| Elaine Harper | Kathy Baker | NIMR | Lee's AA (1973-1980); Chip and Lee's AA (1981-1993) |
| Elilzabeth Davis | Stephanie March | NIMR | NIMR Legal Department |
| Jeff Randall | Ed Harris | NIMR | Head of Security, NIMR |
| Johnny Gage | Randolph Mantooth | NIMR | Lynn & Kevin's paternal half-brother; LA County paramedic, later Chief of Safety at NIMR |
| Joseph Aziz | Pej Vahdat | NIMR | Software designer, NIMR |
| Kathleen Hitchcock Murtagh | A J Cook | NIMR | cetacean veterinarian, daughter of Mark and Elise Hitchcock, marries Donnie Murtagh |
| Katie Leydon | Susan Flannery | NIMR | former CIA agent, intelligence analyst at NIMR, Olympic silver medalist (shooting) |
| Lisa Baker, RN | Kim Delaney | NIMR | nurse, NIMR Infirmary; Larry Baker's wife |
| Lola Hale | Danica D'Hondt | NIMR | staffer, Operations |
| Lynn Murtagh (Morton) PhD | Amy Carlson | NIMR | Dolphin researcher at NIMR, dressage rider, marries Chip Morton; later head of Cetacean Research |
| Marie Adams, | Margaret Colin | NIMR | naval architect, NIMR liaison with Navy on Project Cachalot |
| Marion Cooper | Mitzi Hoag | NIMR | Chip's AA (1972-1980) |
| Maureen Garrity | Kirstie Alley | NIMR | Eileen's younger sister, AA in Cetacean Section at NIMR |
| MCPO Henry Wilson | Jonathan Banks | NIMR | MCPO, NIMR Security |
| Michelle Sloan | Judith Moreland | NIMR | Chip and Lee's AA (1993-on) |
| Nick Costelloe | Ed Marinaro | NIMR | research assistant, Cetacean Dept |
| Pete Holmfeld | Matthew Gray Gubler | NIMR | research assistant, Cetacean Dept |
| Susan Wallace | Leelee Sobieski | NIMR | research assistant, Cetacean Dept |
| Tish Sweetly | Nancy Hsueh | NIMR | staffer, Operations |
| Lt Cdr Mark Tomlinson | Mark Derwin | NIMR/Seaview | Operations Officer, NIMR/Seaview, one of Lynn's best friends |
| Andrea Langer Morton | Jessica Tuck | NJ | Chip's mother (deceased), escaped Nazi Germany in 1938, father and older brother killed for opposing Hitler |
| Brian Michael Morton | Sean Connery | NJ | Chip's paternal grandfather (deceased) |
| Charlie Wagner | Adam Baldwin | NJ | childhood best friend of Joe and Bridey, godfather to the Murtagh kids |
| Michael Thomas Morton | Mark Goddard | NJ | Chip's father (deceased) |
| Siobhan McKenna | Mitzi Kapture | NJ | Mike Cullen's widowed cousin, helps out with house after Ashleen develops MS |
| Tim Malone | David Morse | NJ | Kate's former husband; killed in car accident |
| Brian Murtagh MD | Art Carney | NYC | Lynn's paternal grandfather, highly-regarded neurologist |
| Father Francis Xavier Murtagh | Charles Durning | NYC | Lynn's uncle, later monsignor |
| Eileen Murtagh | Jessica Steen | San Sarita Ranch | Jack's wife, horse breeder, software designer |
| Jack Murtagh | Gary Cole | San Sarita Ranch | Lynn's older brother, rancher, software designer |
| Amy Walkanski | Isabel Gillies | Santa Barbara | Ed Walkanski's wife |
| Brendan (Buddy) Malone Murtagh | Stephen Dorff | Santa Barbara | Kate & Kevin's son; later veterinarian in his father's practice |
| Brianne Malone | Bridget Moynihan | Santa Barbara | Kate and Tim's daughter |
| Heather Murtagh | Marisa Coughlan | Santa Barbara | Kate and Kevin's daughter |
| Karen Leach, MD | Melinda McGraw | Santa Barbara | Lynn's OB/GYN |
| Kate Morton Malone | Dana Delaney | Santa Barbara | Chip's only sibling, marries Tim Malone, later marries Kevin Murtagh after Tim's death |
| Kevin Murtagh DVM | Michael Biehn | Santa Barbara | Lynn's twin, veterinarian, Grand Prix rider; marries Kate Malone after Tim's death |
| Matthew Malone | Stark Sands | Santa Barbara | Kate and Tim's son |
| Ryan Malone | Dylan Moore | Santa Barbara | Kate and Tim's younger daughter |
| Scott Randall | Joseph Gordon-Levitt | Santa Barbara | Jeff's son, Chip's godson |
| Tommy Harrison, MD | Mark Valley | Santa Barbara | childhood friend of Lynn and Kevin; Lynn's GP |
| Wendy Harrison, DVM | Courtney Cox | Santa Barbara | Kevin's partner in veterinary practice |
| Dennis Pierce, MD, FACS | Tim Kang | Santa Barbara General | Angie's husband, adopted son of Hawkeye Pierce and Margaret Houlihan Pierce. Trauma surgeon |
| Andrea Christine Morton | Jessica Capshaw | Santa Barbara/NJ | Chip and Lynn's second child, born May 1983; dressage rider and trainer |
| Shawn Kathleen Morton | Maggie Lawson | Santa Barbara/NJ | Chip and Lynn's oldest child, born April 1982: Grand Prix jumper rider and trainer; barn manager at Diamond Shamrock |
| Lt Cdr Richard Martin, MD, FACS | Wayne Heffley | Seaview/NIMR | Assistant Medical Officer, Seaview/NIMR |
| Lt Cdr Wayne Baines, MD | Wright King | Seaview/NIMR | Assistant Medical Officer, Seaview/NIMR |
| Lt Cdr Will Jamieson, MD, FACS | Richard Bull | Seaview/NIMR | Chief Medical Officer, Seaview/NIMR |
| Admiral Harriman Nelson | Richard Basehart | SSRN Seaview | Seaview's creator, Nobel laureate, genius scientist, author, educator |
| Chief Joe Cannarozzo (Cookie) | Nick Turturro | SSRN Seaview | Seaview's senior mess cook, as talented as a 4-star chef, plankowner |
| Commander Lee Crane | David Hedison | SSRN Seaview | Seaview's second Captain, takes command after death of Capt. John Phillips, Annapolis graduate |
| CPO Bill Johnson | Peter Adams | SSRN Seaview | Assistant mess cook, Seaview |
| CPO Bill Dockery | John Doman | SSRN Seaview | Leading CPO, Weapons Department, Seaview, plankowner |
| CPO Don Richter | Robert John Burke | SSRN Seaview | CPO, Seaview Master at Arms |
| CPO Frank Watson | Pat Culliton | SSRN Seaview | Chief Medical Corpsman, Seaview, plankowner |
| CPO Greg Wilson | Gerald McCullouch | SSRN Seaview | Corpsman, Seaview |
| CPO Jack Nolan | Gregory Jbara | SSRN Seaview | Leading CPO, Electronics Department, Seaview , plankowner |
| CPO Pat O'Hanlon | Terry Kinney | SSRN Seaview | Leading CPO, Maintenance department, Seaview |
| Lt Danny Esposito | Daniel Sunjata | SSRN Seaview | Seaview's dolphin officer, responsible for Seaview's deployed dolphin teams |
| Lt Nick 'Sparks' Peatty | Arch Whiting | SSRN Seaview | Communications Officer, Seaview, plankowner |
| Lt Ray Carter | Robert Clohessy | SSRN Seaview | Sonar Officer, SSRN Seaview |
| Lt. Bobby O'Brien | Derrick Lewis | SSRN Seaview | Diving Officer, Seaview |
| Lt. Cdr. Jim MacKenzie | Michael Swan | SSRN Seaview | Engineering Officer, Seaview |
| Lt. Chris Hodges | Patrick J. Adams | SSRN Seaview | Supply Officer, SSRN Seaview |
| Lt. Ed Walkanski | Rick Rossovich | SSRN Seaview | Maintenance Oficer, SSRN Seaview |
| Lt. Garland Bishop | Paul Comi | SSRN Seaview | Assistant Navigator, Seaview |
| Lt. Larry Baker | Mark Harmon | SSRN Seaview | Weapons Officer, SSRN Seaview, plankowner |
| Lt. Mark Videtti | Ken Wahl | SSRN Seaview | Electronics/Computer Officer, SSRN Seaview |
| LtCdr Chip Morton | Robert Dowdell | SSRN Seaview | Seaview's XO, plankowner, Annapolis graduate |
| Marco Nunez | Marco Lopez | SSRN Seaview | crewman, assigned to control room, plankowner |
| Mark 'Pat' Patterson | Paul Trinka | SSRN Seaview | crewman, assigned to control room, part of Dolphin Detail, plankowner |
| MCPO Joe Brewer | Mike Doyle | SSRN Seaview | Master Chief in Engineering, Seaview, plankowner |
| MCPO Francis Sharkey | Terry Becker | SSRN Seaview | COB, Seaview |
| MCPO Kurt "Curly" Jones | Henry Kulky | SSRN Seaview | Seaview's first COB, plankowner; deceased |
| Seaman Andy Weening | Michael Grant Terry | SSRN Seaview | part of Dolphin Detail |
| Seaman Bob Burrows | Larry Sullivan | SSRN Seaview | part of Dolphin Detail |
| Seaman Lou Rodrigo | Danny Pino | SSRN Seaview | part of Dolphin Detail |
| Seaman Stu Riley | Allan Hunt | SSRN Seaview | crewman, assigned to control room, part of Dolphin Detail, plays guitar |
| Seaman Walter 'Ski' Kowalski | Del Monroe | SSRN Seaview | crewman, assigned to control room, part of Dolphin Detail, plankowner |
| Capt John Brandner | Patrick St. Esprit | SSXN Cachalot | Cachalot project officer |
| Cdr Bill Tomlinson | Robert Urich | SSXN Cachalot | CO, Cachalot |
| Cdr Leonard Williams, MD, FACS | Sterling K Brown | SSXN Cachalot | Chief Medical Officer, Cachalot |
| CPO Alan Kramer | Daniel Roebuck | SSXN Cachalot | Master at Arms, Cachalot |
| CPO Bill Daley | George Eads | SSXN Cachalot | Chief Corpsman, Cachalot |
| Lt Cdr Dan Hoskins | Thomas Gibson | SSXN Cachalot | XO, Cachalot |
| Lt Cdr Dick Ellis | Ezra Knight | SSXN Cachalot | Engineering Officer, Cachalot Cousin to Adam Ellis |
| Lt Cdr Marty Flynn | Marc Blucas | SSXN Cachalot | Weapons Officer, Cachalot |
| Lt Cdr Sam Washington | Lou Gossett | SSXN Cachalot | Electronics/Computer Officer, Cachalot |
| Lt Cdr Todd Hammond | Eric Dane | SSXN Cachalot | Navigator, Cachalot |
| Lt Harry Goldman | Adam Goldberg | SSXN Cachalot | Sonar Officer, Cachalot |
| Lt. Christian Long | Neal McDonough | SSXN Cachalot | Communications Officer, Cachalot |
| Lt. Eric Dryer | Will Estes | SSXN Cachalot | Maintenance Officer, Cachalot |
| Lt. Mark Hansen | Stephen Caffrey | SSXN Cachalot | Diving Officer, Cachalot |
| Lt. Paul Hamilton | Shemar Moore | SSXN Cachalot | Supply Officer, Cachalot |
| MCPO Dave Cerone | Scott Cohen | SSXN Cachalot | COB, Cachalot |
| MCPO Mike Mahoney | Jack McGee | SSXN Cachalot | Master Chief in Engineering, Cachalot |
| Brian Joseph Morton | Stephen Gregory | UPENN | Chip and Lynn's fourth child, born Nov. 1988; veterinary student at UPENN |
| Sean Murtagh | Shane Conrad | USAF | USAFA grad; Jack and Eileen's older son, named after Eileen's brother who was killed in Vietnam; F-16 pilot |
| Adm. Peter Goddard | James Naughton | USN | uncle and godfather to Murtagh kids; COMNAVAIRPAC, later DCNO, then CNO |
| Jimmy Goddard | Dan Gauthier | USN | cousin to Murtagh kids, naval aviator, F-14 pilot, later F-18 pilot, Blue Angel, later CAG, then CO of George Washington |
| Joe Goddard | Jack Scalia | USN | cousin to Murtagh kids, naval aviator, F-14 pilot, later CAG of Enterprise, CO of USS Nimitz, later COMNAVAIRPAC |
| Lt Cdr Dan Hanaway | Michael Trucco | USN | Navy Seal working with Navy dolphins, Annapolis classmate of Mark Tomlinson and Joe Goddard |
| Michael Patrick Morton | Robert Dowdell | USN | Chip and Lynn's third child, born Nov. 1985; Annapolis graduate, enters submarine service |
| Paul Goddard | Tom Selleck | USN | Lynn's cousin; NAVY Seal, later ONI analyst, later CNO |
| Rear Admiral Sean Murtagh, MD, FACS | Brian Dennehy | USN | Lynn and Kevin's biological father, orthopedic surgeon, Bethesda |
| Shannon Murtagh | Bellamy Young | USN | Annapolis graduate, naval aviator; F-18 pilot |
| Cdr Matt Kyle | Lee Horsley | Venture | Captain of Venture, NIMR's surface exploration/deep-sea rescue ship |
| CPO John Redmond | Michael Boatman | Venture | Chief Corpsman, Venture |
| CPO Mark Ford | Ice-T | Venture | Master at Arms, Venture |
| Lt Adrian Martinez | Joel de la Fuente | Venture | Sonar/Radar Officer, Venture |
| Lt Cdr Adam Ellis | Dean Winters | Venture | Navigator, Venture; cousin to Dick Ellis |
| Lt Cdr Craig DeVault | Peter Hermann | Venture | Engineering Officer, Venture |
| Lt Cdr Pete Chambers | Michael Warren | Venture | XO, Venture |
| Lt James Thompson | Derek Webster | Venture | First Lieutenant, Venture |
| Lt John Morranos | Kirk Acevedo | Venture | Weapons Officer, Venture |
| Lt Kenneth Haskell | Robert Sean Leonard | Venture | Communications Officer, Venture |
| Lt Michael Curran | Christian Conrad | Venture | Electronics Officer, Venture |
| Lt Peter Meadows | Keanu Reeves | Venture | Maintenance Officer, Venture |
| Lt. Ben Hillman | Seth Gabel | Venture | Supply Officer, Venture |
| Lt. Cdr Alexandra Parelli, MD, FACS | Callie Thorne | Venture | Chief Medical Officer, Venture/Assistant Medical Officer, NIMR |
| Lt. Joe Lawson | Dennis Haysbert | Venture | Submersibles Officer, Venture (originally part of Seaview's crew) |
| MCPO Javier Cintron | Felix Solis | Venture | COB, Venture |
| MCPO Joe Robertson | Dann Florek | Venture | Master Chief in Engineering, Venture |