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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 Antone | Ross Elliott as Lt. Dave Tulley | Tom West as guest star | 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: Anthony Caruso as Tom Marzack | Linda Lawson as Jill Marzack
Director: Leon Benson

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 Lt. Dave Tulley | Paul Maxwell as guest star | Harlan Warde as guest star | Karl Held as guest star

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: Jack Warford as guest star | Nancy Reynolds as guest star | Ross Elliott as Lt. Dave Tulley | William Woodson as guest star | Aline Towne as guest star | Reed Hadley as guest star
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 guest star | William C. Flaherty as guest star | Dona Lorenson as Anna Bella Nova
Director: Leon Benson

123 :04x06 - Sperling of Lamatsue

Mike must retrieve a cache of medical supplies that were dumped in a river before a dictator can get his hands on them.
Guest Stars: Al Santos as guest star | Kimo Mahi as guest star | Sharon Bercutt as guest star | John Barclay (2) as guest star
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: Sue Randall as guest star | Jack Ging as guest star | Ross Elliott as Lt. Dave Tulley
Writer: Jack Rock

125 :04x08 - Mercy Trip

Mike is assigned to chart a path through mine infested waters to that medical supplies can reach a port city suffering from an epidemic of cholera.
Guest Stars: Vitina Marcus as guest star | Gregory Gaye as guest star | Ken Drake as Dr. Levy

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: Darlene Tompkins as guest star | Robert Montgomery Jr. as guest star | Tyler McVey as guest star | Wayne Mallory as guest star

127 :04x10 - Sonar Story

Mike goes up against underwater heroin smugglers and uses sonar to foil their scheme.
Guest Stars: Joseph Breen as guest star | Mark Dana as guest star | Phil Dean (1) as guest star | Joan Patrick as guest star | Juli Reding as guest star

128 :04x11 - Amigo

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

129 :04x12 - The Aquanettes

Mike helps three hot chicks undergoing astronaut training and must face unexpected perils.
Guest Stars: Nan Adams as guest star | Valerie Allen as guest star | Mary Lawrence (1) as guest star | Gloria Marshall as guest star

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: King Moody as guest star | Gertrude Michael as guest star | Paul Dixon (1) as guest star | Bill Berger as guest star
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: Irene Tedrow as guest star | Mike Steen as guest star | Robert F. Simon as guest star | Lisabeth Hush as guest star
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: Kathryn Drayton as guest star | Robert Karnes as guest star
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: Charles Swain as guest star | Robert Sampson (1) as guest star | Ted Knight as guest star | Lili Kardell as guest star | Francis Bethencourt as guest star
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 guest star | William C. Flaherty as guest star | Dale Ishimoto as guest star

135 :04x18 - Cougar

Mike's attempts to capture a poisonous lion fish are complicated by the presence of a restless youth and his galpal.
Guest Stars: Robert Ridgely as guest star | Susan Silo as guest star

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 making him assume room temperature.
Guest Stars: George Johnson (2) as guest star | John Hudson (1) as guest star | Bill Edwards (1) as guest star

137 :04x20 - The Octopus Story

Marking 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 guest star | Jan Harrison as guest star

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 guest star | Kathie Browne as Eleana Dales | Ric Marlow as guest star

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: John Zaremba as Dr. Brewnie | Beau Bridges as Warren Tucker | Denise Alexander (1) as Carolyn Tucker
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: Nan Peterson as guest star | Ron Hayes as guest star | John Considine as guest star | Robert Christian (2) as guest star | Stewart Bradley 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 hot chick and her father become homicidal after eating a type of fish that causes hallucinations while vacationing in the Bahamas.
Guest Stars: Michael Whalen as guest star | Margie Regan as guest star | Peter Forster as guest star | James Forrest 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 no talent assclown movie star responsible.
Guest Stars: Patrick Waltz as guest star | Nancy Valentine as guest star | John Rodney as guest star | Barbara Frederick as guest star | Terry Becker 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 is stealing diamonds from a sunken yacht but Mike is unable to provide an alibi for himself due to the fact that he's on a top-secret mission for the government.
Guest Stars: Walter Reed as guest star | Jean Porter as guest star | John Bryant 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 baddies are out to steal the device.
Guest Stars: Ken Roberts (3) as guest star | Lisabeth Hush as Linda Calway | Kelton Garwood as Kendrick Calway
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: Jana Lund as guest star | Mark Andrews (1) 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: Bob Gilbreath as guest star | John Rodney as Defense Attorney | Bruce Dern as John Furillo | Ric Marlow as Robert Lewis Bates | Ken Drake as George Morton | Lane Bradford as guest star | Harry Lauter as John Morton | Sue Randall as Peg Nicholson | Chris Robinson (1) as Kelsey | Keith Andes as Todd Webster
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: Drama
Status: Canceled/Ended
Network: Syndicated ( USA)
Runtime: 60 Minutes
Premiere: January 04, 1958
Ended: September 23, 1961
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