Directed by: J. Addiss

Cast: Richard Basehart, David Hedison, Robert Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Paul Fix, Francis X. Bushman

While the Seaview is following a object that has plunged into the water, they find a man in the water with only a bag with him. Inside the bag are 6 toys. The toys are let out of the bag and ....

Day of Evil

Written by:William Welch

Executive Producer: Irwin Allen

Directed by: Jerry Hopper

Cast: Richard Basehart, David Hedison, Robert Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: None

While the Seaview is racing to meet the U.S. Fleet on time, the engines are approaching the warning levels. Nelson has Patterson try to dampen the pile by hand but when he enters the Reactor Room he finds he is not alone and he is knocked unconscious. The p ile explodes and he is exposed to deadly levels of radiation. The ship is damaged by the explosion and Patterson is taken to sick bay. Meanwhile, the fake Nelson arrives and orders Crane to activate the nuclear missiles.....

Deadly Waters

Written by:Robert Vincent Wright

Executive Producer: Irwin Allen

Directed by: G. Mayer

Cast: Richard Basehart, David Hedison, Robert Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Lew Gallo, Don Gordon, Harry Lauter

Nelson and the Seaview crew rush to save a deep sea diver trapped aboard a crashed nuclear sub. The diver turns out to be Kowalski's brother (Stan). Nearing the sub, Crane risks his life to save the unconscious man and bring him to the Seaview. Just as they get aboard the ship two missiles explode near the ship and cause it to be damaged. It sinks to the ocean bottom. Nelson tries to reach the surface with the flying sub.....

Thing From Inner Space

Written by:William Welch

Executive Producer: Irwin Allen

Directed by: A. March

Cast: Richard Basehart, David Hedison, Robert Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Hugh Marlowe, Dawson Palmer

Nelson and the Seaview sail for the Murro Atol, an island off Morocco. They are looking for a monster that Bainbridge Wells claims exists. When Wells was attacked on the island earlier, his camera crew was killed, but the crew don't know that one of the men was Pattersons father. He intends to prove that Wells was a fault for his death by finding the missing film.....

The Death Watch

Written by:William Welch

Executive Producer: Irwin Allen

Directed by: Leonard Horn

Cast: Richard Basehart, David Hedison, Terry Becker,

Guest Cast: None

Nelson enters the Seaview and finds no one aboard. He calls on the intercom but no one answers. The hatch is sealed and cant be opened so he goes through the ship and finds Sharkey in the Crews quarters. Sharkey tells him he dismissed the entire crew and to ld him to wait for his arrival. Nelson has no memory of that he only knows that he needs to find a gun as soon as possible. Meanwhile a shadow of a person slips on to the ship. It is Capt. Crane and he has orders to find and kill Nelson.......

Deadly Invasion

Written by:John & Ward Hawkins

Executive Producer: Irwin Allen

Directed by: Jerry Juran

Cast: Richard Basehart, David Hedison, Robert Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Warren Stevens, Michael Fox, Ashley Gilbert, Brent Davis

While the Seaview is looking at some strange meteors, they change course and head directly for the ship. Several of the objects hit and penetrate the ship and Sharkey brings one to the control room. As the admiral examines it, the top pops open and a gas co mes out and knocks everyone out. Capt. Crane wakes up and revives the others so they can begin to search the ship for the other canisters. Nelson takes the first object to the lab and tries to open the canister. When he exposes it to x-rays the cylinder sho ots an electrical blast across the room. The canister is open and Nelson finds that the cylinder is really a tiny space ship......

The Haunted Submarine

Written by:William Welch

Executive Producer: Irwin Allen

Directed by: Harry Harris

Cast: Richard Basehart, David Hedison, Robert Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: None

Kowalski and Chief Sharkey hear strange sounds coming from the ship at different times. Sharkey tells Capt. Crane what happened and Crane has no explanation. He is concerned because he has had several reports from different crew members. As he is discussing this with Mr. Morton Kowalski says that radar is picking up a ship on the surface and it doesn't answer to radio calls. When Capt. Crane looks out through the periscope he cant believe what he sees. It is a 200 year old square rigged frater. He has Mr. Mor ton look as well and then orders them to surface to try to make contact with the ship........

The Plant Man

Written by:Donn Mullally

Executive Producer: Irwin Allen

Directed by: Harry Harris

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Richard Bull, Arch Whiting

Guest Cast: William Smithers

As the Seaview is on its way to an undersea lab run by Dr. John Wilson, Nelson calls to the lab to let them know they will be there shortly. John Wilson knows the his brother is on the Seaview, they are in constant communication because they are identical t wins. John Wilson tells Nelson that everything is going well and he is looking forward to seeing them. After Nelson leaves the room, Ben Wilson contacts him and orders him to complete the experiment now. John Wilson is the weaker brother and he gives in and does as his brother orders. When he does, the experiment goes wrong and the lab is badly damaged.......

The Lost Bomb

Written by:Oliver Crawford

Executive Producer: Irwin Allen

Directed by: J. Mayer

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Richard Bull, Arch Whiting

Guest Cast: John Lupton, Jerald Mohr

In the control room of the Seaview, a civilian bomb expert (Doc Bradley) and Chief Sharkey are saying hello. The are old friends from childhood. Kowalski says that there is sonar contact and it is a submarine. There is not supposed to be any boat traffic in the area. The Seaview watches as the unidentified submarine launches a rocket and destroys a cargo plane that is carrying a bomb that they were supposed to pick up. The bomb does not go off and they crew locate it on the ocean bottom. While the Seaview is heading for the bomb, the unidentified sub is looking for it also. Crane and Kowalski leave in the flying sub to try to guide the other sub away while the Seaview picks it up. The other sub (Vulcan) figures out that they are a decoy and shoots the flying su b down and it goes to the ocean bottom........

The Brand of the Beast

Written by:William Welch

Executive Producer: Irwin Allen

Directed by:J. Addiss

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: None

The Seaview has received a S.O.S. from a British ship (Columbine) that is breaking up in a bad storm. Nelson orders the ship to go at flank speed to help rescue the scientists on board. However the ship has been having some problems with the Nuclear engines and they should not go at flank speed for any length of time. Nelson still wants to go and after a short while the engines have a malfunction and will explode within minutes. Admiral Nelson goes into the reactor room and fixes the problem. When he gets bac k to his cabin he notices that his hand has become very hairy........

The Creature

Written by:John and Ward Hawkins

Executive Producer: Irwin Allen

Directed by:J. Addiss

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Lyle Bettger

While Nelson is out in the Flying sub, Capt. Crane and the Seaview go to investigate a strange life form on the ocean bottom. Crane and Kowalski swim out to investigate it when it attacks them. It strikes Crane with a bolt of lightening when they are too cl ose to it. Kowalski swims to hide in some rocks and hides. As he watches Crane's body falls to the ocean floor the Seaview tries to rescue them but the creature disables the submarine..........

Death From the Past

Written by: Sidney Marshall, Charles Bennett

Executive Producer: Irwin Allen

Directed by:J. Addiss

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: John Van Dreelen, Jan Merlin

As the Seaview is cruising along the ocean bottom, Kowalski reports a reading on his sonar that may be a sunken sub. As they near the object it is hidden under moss & shuch but it appears to be a surface ship. Patterson reports that the hydrophone has picke d up heartbeats, that someone may be alive. Just then the alarm for mines sounds and Crane orders the sub to reverse but they still set of a mine. While the submarine is being repaired, Crane and Kowalski suite up to investigate.........

The Heat Monster

Written by:Charles Bennett

Executive Producer: Irwin Allen

Directed by:J. Mayer

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Don Knight, Alfred Ryder

Professor Bergstrom has made contact with a voice he believes is friendly from outer space. When he and his associate turn on the laser beam for it to come in on it destroys the shack they are working in the arctic. Just before it is destroyed his associate gets out a distress signal that the Seaview picks up. They head for the area immediately but when they get there the place is destroyed and the only survivor is Professor Bergstrom. They notice strange blocks of ice and they have one brought on board the S eaview. As Nelson and Crane are talking with bergstrom in the observation nose, a warning is sounded for a fire onboard........

The Fossil Men

Written by:James N. Whiton

Executive Producer: Irwin Allen

Directed by:J. Addiss

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Brendan Dillon, Jerry Catron

While the Seaview is on a routine cruise, Patterson alerts Crane that the hydrophone has picked up a strange sound. Crane orders the sub to dive so he can investigate. As Nelson and Crane are talking, Chip interrupts that there is something strange on the radar. It turns out to be heavy turbulence that damages the ships rudder controls. Before they can repair there is a knocking on the outside of the ship, they open the crash doors and see a almost human looking fossilized creature.........

The Mermaid

Written by:William Welch

Executive Producer: Irwin Allen

Directed by:Jerry Hopper

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Diane Webber

The Seaview is on a routine mission taking a count of seals when Sharkey takes a top secret order message to Admiral Nelson. Crane is in the observation nose watching the seals when he sees what he thinks is a mermaid. He tells the Admiral and wants to inve stigate but the Nelson will have none of it. Crane decides that he will investigate the mermaid on his own and goes ashore to search underwater by himself. He searches and finds her and captures her and brings her back to the Seaview hidden in a large bag. Admiral Nelson orders Morton to have Crane report to him as soon as he is aboard. Nelson asks why he hasn't reported but Morton says he told him but he just walked by and went to the lab........

The Mummy

Written by:William Welch

Executive Producer: Irwin Allen

Directed by:Harry Harris

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: None

Crane and Nelson are on a secret mission to pick up a 3000 year old mummy and bring it back to the Seaview. They are to transport it to a middle eastern country at a certain time. While Nelson and Crane are loading it in the flying sub, the casket opens a l ittle and Crane passes out. Nelson wakes him and the return to the Seaview. Crane goes to sick bay and is checked out by Doc and told to get some rest. The mission gets underway with Morton as acting captain and all seems to be going well until the mummy co mes out of its casket.........

The Shadowman

Written by:Rik Vollaerts

Executive Producer: Irwin Allen

Directed by:J. Addiss

Cast: Richard Basehart, David Hedison, Bob Dowdell, Del Monroe, Paul Trinka

Guest Cast: None

The Seaview has been assigned to carry the launch controls for a 4th spacecraft (the previous 3 were destroyed), since they believe that no sabotage can occur at sea. To remove any chance of failure the Seaview crew has been ordered off the ship leaving onl y 5 members left. In the control room Crane sees that the sonar has picked up something strange that seems able to absorb the electronic signals from the Seaview. It quickly approaches and Crane orders the engines reversed as the thing surrounds the ship. T he crew is knocked unconscious and a shadow figure enters the ship and takes over Morton...........

No Escape From Death

Written by:William Welch

Executive Producer: Irwin Allen

Directed by:Harry Harris

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: None

The Seaview is trying to find a mysterious sea lab as Crane reports that sonar has picked up a submarine following them. The submarine closes in and collides with the Seaview. The Seaview is damaged heavily and all people fight fires and the water is floodi ng the ship. The Seaview is unable to surface and instead goes to the bottom. Crane has noticed the sea lab by the other sub and he and Kowalski and Patterson go to investigate..........

Doomsday Island

Written by:Peter Germano

Executive Producer: Irwin Allen

Directed by:Jerry Hopper

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Jock Gaynor

Nelson and Sharkey are taking the flying sub to investigate a uncharted island while the Seaview crew is busy picking up specimens from sea nets. Morton reports picking up something large that is being brought aboard. It is a large egg and they store it in the Missile room. That night the egg hatches and out comes a amphibian creature that kills the man guarding the door. It next attacks Kowalski and starts roaming the ship...............

The Wax Men

Written by:William Welch

Executive Producer: Irwin Allen

Directed by:H. Jones

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Michael Dunn

The Seaview is docked and is picking up crates of wax men to take to Washington. They are being stored in the Missile room. Everyone is aboard by Capt. Crane and Nelson orders Morton to sail as soon as he is aboard. Meanwhile Kowalski and Sharkey check the boxes and find one is open and the wax man gone. They find the wax man standing against a wall. They put it back and leave the room. The wax man gets back out of the crate and starts moving about the ship. When Crane boards the Seaview he asks Morton why no guards are posted outside but gets no answer. He notices that he looks waxy as do all the other men..............

Deadly Cloud

Written by:Rik Vollaerts

Executive Producer: Irwin Allen

Directed by:Jerry Hopper

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Robert Carson

Nelson believes that the natural catastrophes that are occurring all over the earth are linked to a huge cloud over the Pacific. Crane goes out in the flying sub to inspect it and he films as he goes. Crane calls the admiral and says he is being drawn into the cloud and the sub is damaged and Crane is knocked unconscious. While he is unconscious a alien gets in the flying sub and looks just like Crane return to the Seaview. Meanwhile, Nelson orders the Seaview to enter the cloud but it can't because of what s eems to be a forcefield...........

Destroy Seaview

Written by:Donn Mullally

Directed by:J. Addiss

Cast: Richard Basehart, David Hedison, Bob Dowdell, Terry Becker, Del Monroe, Paul Trinka, Arch Whiting, Richard Bull

Guest Cast: Jerry Catron, Arthur Space

Nelson, Crane and a scientist are searching a cave beneath the bottom of the sea that is highly radioactive for a special element that will be the ultimate weapon for who ever holds it. After they find it, Nelson blows up the tunnel entrance trapping Crane and the scientist inside then he goes back to the Seaview and tells Morton that the others are dead. In his cabin, Nelson sends a message to a foreign power where to get the Zycron but while they are talking Sparks picks up the signal and Morton has Kowalsk i follow the transmission right to the Admirals cabin...........

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Episode synopsys by Anne Tarquinio

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