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| Lieutenant (j.g.) Tim O'Neill | Ted Raimi | Seasons 1, 2, & 3, promoted to full Lt. Season 3 |
| Captain Nathan Bridger | Roy Scheider | Seasons 1, 2, & guest star in several Season 3 Eps |
| Commander Jonathan Devin Ford | Don Franklin | Seasons 1, 2, & 3 |
| Lucas Wolenczak | Jonathan Brandis | Seasons 1, 2, & 3, promoted to Ensign in Season 3 |
| Darwin | Darwin / Frank Welker | Seasons 1, 2, & 3 |
| Lieutenant Commander Katherine Hitchcock | Stacy Haiduk | Season 1 |
| Lieutenant Benjamin Krieg | John D' Aquino | Season 1, guest star in Season 3 |
| Chief Manilow Crocker | Royce D. Applegate | Season 1 |
| Chief Miguel Ortiz | Marco Sanchez | Seasons 1 & 2 |
| Dr. Kristin Westphalen | Stephanie Beacham | Season 1 |
| Dr. Wendy Smith | Rosalind Allen | Season 2 |
| Lieutenant James Brody | Edward Kerr | Seasons 2 & 3, Promoted to Lt. Commdr. in Season 3 |
| Tony Piccolo | Michael Deluise | Seasons 2 & 3, Promoted to Warrent Officer in S3 |
| Ensign Lonnie Henderson | Kathy Evison | Seasons 2 & 3, Promoted to Lt. in Season 3 |
| Dagwood | Peter Deluise | Seasons 2 & 3 |
| Captain Oliver Hudson | Michael Ironside | Season 3 |
| Lieutenant J.J. Fredricks | Elise Neal | Season 3 |
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| Richard Herd (Admiral William Noyce) | "To Be or Not to Be", "The Devil's Window", "Better Than Martians", "Greed For a Pirate's Dream", "Whale Song", "The Stinger", "Hide and Seek", "The Last Lap of Luxury", "The Good Death", "An Ocean on Fire", "The Sincerest Form of Flattery" |
| Shelley Hack (Captain Marilyn Stark) | "To Be or Not to Be" |
| Brenda King (Carol Bridger) | "To Be or Not to Be", "An Ocean on Fire" |
| W. Morgan Sheppard (The Professor) | "To Be or Not to Be", "seaWest", "Nothing But the Truth", "Such Great Patience", "The Sincerest Form of Flattery" |
| Roscoe Lee Browne (Dr. Raleigh Young) | "The Devil's Window","Greed For a Pirate's Dream" |
| Robert Engels (Malcolm Lansdowne) | "The Devil's Window", "Whale Song", "Hide and Seek" |
| Topol (Dr. Rafik Hassan) | "Treasure of the Mind" |
| Timothy Omundson (Dr. Levin) | "Games", "Give Me Liberte","Knight of Shadows", "Bad Water" |
| Kellie Martin (Chloe) | "Brothers and Sisters" |
| Seth Green (Nick) | "Photon Bullet" |
| Sarah Koskoff (Julianna) | "Photon Bullet", "Abalon" |
| Tim Russ (Martin Clemens) | "Photon Bullet" |
| Kent McCord (Commander Scott Keller) | "Better Than Martians", "Such Great Patience", "Fear That Follows", "Dream Weaver", "Splashdown" |
| Jonathan Banks (Maximilian Scully) | "Whale Song", "Resurrection" |
| Peter DeLuise (Wiggins) | "Whale Song" |
| Jesse Doran (General Thomas) | "Whale Song", Such Great Patience", "Daggers", "Fear That Follows", "When We Dead Awaken" |
| William Shatner (Milos Tezlof) | "Hide and Seek" |
| Charlton Heston (Abalon) | "Abalon" |
| Dustin Nguyen (Chief William Shan) | "Abalon", "Such Great Patience", "The Good Death","An Ocean on Fire" |
| Kristoffer Tabori (Dr. LawrenceWolenczak) | "An Ocean on Fire" |
| Sam Jenkins (Maria) | "Daggers", "Dagger Redux" |
| Michael Costello (UEO Sec. General McGath) | "Fear That Follows", "The Sincerest Form of Flattery", "By Any Other Name", "Lostland", "Alone", "Dagger Redux", "Blindsided", "Brave New World", "In the Company of Ice and Profit", "Smoke on the Water", "Destination Terminal", "Chains of Command", "Spindrift", "Equilibrium", "Resurrection", "Good Soldiers","Brainlock", "Weapons of War" |
| Jennifer Sky (Shop Girl) | "Sympathy For the Deep" |
| Dom DeLuise (Nick Piccolo) | "Vapors" |
| David DeLuise (Manager) | "Vapors" |
| Gregory Martin (Rawlings) | "Dead End" |
| Leslie Rae Bega (Sandra) | "And Everything Nice" |
| Mark Hamill (Tobias LeConte) | "Dream Weaver", "Splashdown" |
| Dawn Robinson (Sarah Toenin) | "Watergate" |
| Roy Scheider (Captain Nathan Bridger) | "Brave New World", "Equilibrium", "Good Soldiers" |
| Michael York (President Alexander Bourne) | "Brave New World", "Spindrift","Brainlock" |
| Andrew Stahl (General Armand Stassi) | "Brave New World", "Chains of Command", "Spindrift", "Good Soldiers" |
| John D'Aquino (Ben Krieg) | "In the Company of Ice and Profit" |
| Tim DeKay (Lawrence Deon) | "In the Company of Ice and Profit", "Destination Terminal", "Brainlock" |
| Ralph Wilcox (Mason Freeman) | "In the Company of Ice and Profit", "Destination Terminal", "Brainlock", "Reunion" |
| Patricia Charbonneau (Elaine Morse) | "Smoke on the Water", "Resurrection" |
| Karen Fraction (Dr. Perry) | "Spindrift", "Equilibrium", "Second Chance", "Weapons of War" |
| Julia Nickson (Lieutenent Commander Heiko Kimura) | "Weapons of War" |
Other Notable Credits:
Seaquest Created By: Rockne S. O'Bannon
"Lostland"
Written By: Ted Raimi & David J. Burke
"The Siamese Dream"
Written By: Jonathan Brandis & David J. Burke
"Blindsided", "Splashdown", "Brave
New World", "Spindrift", "Resurrection","Weapons
of War"
Directed By: Anson Williams