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Season 4

118 :04x01 - Point of No Return

This time it's Mike who needs rescuing when the cable attached to his Scubasphere breaks.
Guest Stars: Joyce Meadows as Dorothy Maybrook | Paul Birch as Dr. Bainbridge | Franco Corsaro as Prof. Antone Ricardees | Ross Elliott as USCG Lt. Dave Tulley | Tom West as TBD | Ronald Brown as Vic Jennings
Director: Leon Benson

119 :04x02 - River Treasure

Mike happens upon a jealous couple prospecting for emeralds while surveying a remote river in South America.
Guest Stars: Linda Lawson as Jill Marzack | Anthony Caruso as Tom Marzack
Director: Leon Benson
Writer: Don Archer

120 :04x03 - The Destroyers

Mike investigates when a radar jamming signal causes two sea vessels to collide with one another.
Guest Stars: Ross Elliott as USCG Lt. Dave Tulley | Paul Maxwell as Dr. Neal Martin | Harlan Warde as USCG Cmdr. Ben White | Karl Held as USCG Radarman
Director: Leon Benson

121 :04x04 - Vital Error

A newspaperman becomes convinced that he's dying from a fatal illness and tries to end his life in such a way that his wife can collect his insurance.
Guest Stars: Reed Hadley as Fred Darrow | Aline Towne as Elaine Darrow | William Woodson as Dr. John Gregory | Ross Elliott as USCG Lt. Dave Tulley | Nancy Reynolds as Nurse Davis | Jack Warford as USCG Radioman (as John Warford)
Director: Leon Benson

122 :04x05 - The Dancer

Mike must rescue a scuba diving ballerina when she catches her foot between loose plates of a sunken freighter.
Guest Stars: John Hackett as Bob Forrester | William C. Flaherty as USCG Cmdr. Frank Martin, MD (as Bill Flaherty) | Dona Lorenson as Anna Buonanova (as Dana Lorenson)
Director: Leon Benson

123 :04x06 - Sperling of Lamatsue

Mike must retrieve a cache of medical supplies that were dumped in a river before a local witch doctor can get his hands on them.
Guest Stars: John Barclay (2) as Dr. Jan Sperling | Sharon Bercutt as Rayna | Kimo Mahi as Vinshaw | Al Santos as TBD
Director: Leon Benson
Writer: Sylvia Drake

124 :04x07 - Rescue

Mike sets a charge to blow up a sunken ship that is a threat to a busy shipping lane but is unaware that a treasure hunting friend is trapped inside.
Guest Stars: Jack Ging as Lou James | Sue Randall as Mary Carter | Ross Elliott as Lt. Dave Tulley
Writer: Jack Rock

125 :04x08 - Mercy Trip

Mike is assigned to chart a path through mine-infested waters so that medical supplies can reach a port city suffering from an epidemic of cholera.
Guest Stars: Gregory Gaye as Mayor Sunander (as Gregory Gay) | Vitina Marcus as Tali (as Ventina Marcus) | Ken Drake as Dr. Levy
Director: Leon Benson

126 :04x09 - Hot Tracer

A youth to whom he's been giving diving lessons complicates Mike's efforts to retrieve a pair of radioactive cylinders.
Guest Stars: Robert Montgomery Jr. as Chan Harrington III | Tyler McVey as Dr. Widmer | Wayne Mallory as Hendricks | Darlene Tompkins as Ginny
Writer: Don Moore

127 :04x10 - Sonar Story

Mike goes up against underwater heroin smugglers and uses sonar to foil their scheme.
Guest Stars: Mark Dana as Dr. Briggs | Juli Reding as Blonde Woman (as Juli Reding Hunter) | Joseph Breen as Mr. Hart | Joan Patrick as Brunette Woman | Phil Dean (1) as USCG Commander Kelly | Michael Keith as Helicopter Lookout
Director: Leon Benson

128 :04x11 - Amigo

With the help of a young Mexican boy, Mike locates a safe entrance to an underwater fossil cave.
Guest Stars: Vikki Dugan as Cheryl Carter | Noel Drayton as guest star | Rafael Lopez as guest star | Eugene Martin as guest star

129 :04x12 - The Aquanettes

Mike helps three women undergoing astronaut training and faces unexpected perils.
Guest Stars: Valerie Allen as Dana Perry | Nan Adams as Barbara Clinton | Gloria Marshall as Joanna Sue Toliver | Mary Lawrence (1) as Dr. Barnes
Director: Leon Benson

130 :04x13 - Survival Kit

A German consulate hires Mike to salvage a survival kit from the wreckage of a World War II U-Boat.
Guest Stars: Gertrude Michael as Mrs. Friedrich | Bill Berger as Carl Friedrich | King Moody as Consul Baumer | Paul Dixon (1) as Carl's Diving Partner
Director: Leon Benson
Writer: Don Archer

131 :04x14 - Expedition

Mike helps his former college history professor search for buried pirate treasure off the North Carolina coast.
Guest Stars: Robert F. Simon as Professor Aaron Halliday | Lisabeth Hush as Zoƫ White | Irene Tedrow as Naomi Roundtree | Mike Steen as Sonny Kendall
Director: Leon Benson

132 :04x15 - Bionics

After a man is killed testing an underwater device, Mike convinces his hesitant daughter to continue her father's work.
Guest Stars: Kathie Browne as Kathryn Drayton | Robert Karnes as USCG Commander Flint
Writer: Jack Kelsey

133 :04x16 - The Defector

An man offers to pay Mike extra to continue teaching diving lessons to an inept student.
Guest Stars: Lili Kardell as Carole Sloan | Robert Sampson (1) as Bob Hicks | Francis Bethencourt as Vincent Morale | Ted Knight as Steve Powery | Charles Swain as Alfred
Director: Leon Benson

134 :04x17 - Niko

Mike and two other divers try to disarm a pair of unexploded torpedoes at the bottom of a busy harbor.
Guest Stars: Lane Bradford as Frank Judd | William C. Flaherty as USCG Lieutenant (as William Flaherty) | Dale Ishimoto as Niko Sugimoto
Director: Leon Benson
Writer: Don Archer

135 :04x18 - Cougar

Mike's attempts to capture a poisonous lion fish are complicated by the presence of a restless youth and his girlfriend.
Guest Stars: Robert Ridgely as Cougar Norris (as Robert Ridgley) | Susan Silo as Leilani
Director: Leon Benson

136 :04x19 - Sub Hatch

A test pilot must spend 24 hours in a decompression chamber after a dive in order to keep the bends from killing him.
Guest Stars: John Hudson (1) as Jerry Blaine | George Johnson (2) as USCG Lt. Hartwell | Bill Edwards (1) as USCG Commander Murdock
Director: Leon Benson
Writer: Don Moore

137 :04x20 - The Octopus Story

Markings on the body of a dead diver convince a marine biologist that a killer octopus inhabits a lagoon. Mike must prove or disprove the theory.
Guest Stars: Ken Curtis as Dean Austin | Jan Harrison as Betty Rainard
Director: Leon Benson

138 :04x21 - Quicksand

Mike tries to make sure two salvage divers don't disappear while diving on a sunken boat off the coast of Yucatan. It seems as though a previous diver vanished completely.
Guest Stars: Corey Allen as Young | Ric Marlow as Slade | Kathie Browne as Eleana Dales | Richard Bermudez as Pedro
Director: Leon Benson

139 :04x22 - Lost Island

Mike and an escaped Mexican convict uncover nefarious activity on an atoll off the South American coast.
Guest Stars: Roy Dean as guest star | Bob Shield (1) as guest star

140 :04x23 - Baby

Hostile natives interfere with Mike's passage downriver when he attempts to get a missionary's baby to a hospital for medical attention.
Guest Stars: Denise Alexander (1) as Carolyn Tucker | Beau Bridges as Warren Tucker | John Zaremba as Dr. Brewnie
Director: Leon Benson

141 :04x24 - Confidential Mission

Mike goes undercover once again, this time as a tourist, in order to locate an underwater missile launcher in the Caribbean.
Guest Stars: Jan Arvan as guest star | Terry Becker as guest star | Dehl Berti as guest star | Ken Drake as guest star

142 :04x25 - Underwater Pirates

Mike is hired by an old Navy buddy to salvage a sunken freighter but pirates are out to make sure they get there first.
Guest Stars: Stewart Bradley as guest star | Robert Christian (2) as guest star | John Considine as guest star | Ron Hayes as guest star | Nan Peterson as guest star

143 :04x26 - The Meet

This time, Mike gets involved in couterfeiting and kidnapping when he's hired to work for the Treasury.
Guest Stars: Bill Catching as guest star | Robert Clarke (2) as guest star | Richard Evans as guest star | Larry Pennell as guest star | Lorrie Richards as guest star

144 :04x27 - Dark Evil

A woman and her father vacationing in the Bahamas become homicidal after eating a type of fish that causes hallucinations.
Guest Stars: James Forrest as guest star | Peter Forster as guest star | Margie Regan as guest star | Michael Whalen as guest star

145 :04x28 - Sunken Car

Mike discovers that a sunken truck is tied into the murder of a political boss and the killer is someone close to him.
Guest Stars: Don Devlin as guest star | John Marley as guest star | Dan White (1) as guest star

146 :04x29 - Hit and Run

After a friend of his is seriously injured in a speedboat accident, Mike goes after the movie star responsible.
Guest Stars: Terry Becker as guest star | Barbara Frederick as guest star | John Rodney as guest star | Nancy Valentine as guest star | Patrick Waltz as guest star

147 :04x30 - The Saint Story

Once again, Mike is somewhere in Latin America. This time he's searching a harbor for a sunken statue and discovers a homing beacon being used to guide submarines into the harbor.
Guest Stars: Salvador Baguez as guest star | Victor Buono as guest star | Pilar Del Rey as guest star | Nestor Paiva as guest star

148 :04x31 - Impostor

An impostor posing as Mike steals diamonds from a sunken yacht but Mike is unable to provide an alibi due to the fact that he's on a top-secret mission for the government.
Guest Stars: John Bryant as guest star | Jean Porter as guest star | Walter Reed as guest star

149 :04x32 - Superman

Mike must get insulin to a diabetic whose boat has been sunk--by his wife.
Guest Stars: Russ Conway as guest star | Sue Randall as guest star

150 :04x33 - Roustabout

Mike once again finds himself in a full blown mess when he travels to South America. This time, his assistant is trapped underwater by an overturned truck containing drums of poison that could endanger the water supply of a port city.
Guest Stars: Kenneth Tobey as Pete Butler | Anna Navarro as Maria | Rodolfo Hoyos, Jr. as Policeman | David Renard as Durango Lima
Director: Leon Benson
Writer: Don Archer

151 :04x34 - P.T. Boat

A rich eccentric has invented a remote control guidance device and hires Mike to test it out, but some criminals set out to steal the device.
Guest Stars: Kelton Garwood as Kendrick Calway | Lisabeth Hush as Linda Calway | Ken Roberts (3) as guest star
Director: Leon Benson
Writer: Don Archer

152 :04x35 - Starting Signal

Someone is sabotaging a series of experiments that Mike is conducting for the Coast Guard.
Guest Stars: Ross Elliott as guest star | Thomas Nello as guest star | Robert F. Simon as guest star

153 :04x36 - Skipper

Mike investigates when a hydroplane rams into a Coast Guard ship during a race.
Guest Stars: Mark Andrews (1) as guest star | Jana Lund as guest star

154 :04x37 - Crime at Sea

When her father is murdered, the daughter of Mike's old Navy UDT commander gets our hero to investigate.
Guest Stars: Keith Andes as Todd Webster | Chris Robinson (1) as Kelsey | Sue Randall as Peg Nicholson | Harry Lauter as John Morton | Lane Bradford as guest star | Ken Drake as George Morton | Ric Marlow as Robert Lewis Bates | Bruce Dern as John Furillo | John Rodney as Defense Attorney | Bob Gilbreath as guest star
Director: Leon Benson

155 :04x38 - Round Up

Mike must disarm a torpedo that's been sent into the outflow tank of a hydroelectric plant.
Guest Stars: William C. Flaherty as Coast Guard Commander | Jack Nicholson as John Stark
Director: Leon Benson
Warning: Sea Hunt (1958) guide may contain spoilers
Classification: Scripted
Genre: Adventure | Drama
Status: Canceled/Ended
Network: Syndicated ( USA)
Runtime: 30 Minutes
Premiere: January 04, 1958
Ended: September 23, 1961
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