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Season guide

Voyage to the Bottom of the Sea: Season 3

26 episodes Premiered Sep 18, 1966
Previously on Voyage to the Bottom of the Sea

Season 3 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Directly follows the overarching narrative developments of Voyage to the Bottom of the Sea Season 2.
  • ⚡ Faction dynamics and core character alliances shift under escalating external stakes.
  • ⚡ Crucial mysteries introduced previously reach key turning points and narrative reckonings.
  • ⚡ Sets up serialized story arcs that build directly toward the climactic season finale.
Season 3 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 3 Progress Shield

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Binge Efficiency Engine

Season 3: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

15%
85%
Mytharc (4): Crucial lore & season climaxes
Core (22): Character development & subplots
Side Quest (0): Standalone / filler
S3·E1 Mytharc

Monster from the Inferno

Sep 18, 1966

Seaview is investigating a thousand-mile wide communication blackout. The source of this is a large alien brain found under the sea. It is broght aboard and takes over visiting sci

S3·E2 Mytharc

Werewolf

Sep 25, 1966

Two scientists examining a radioactive volcano are attacked by a wolf. One dies, and the survivor is infected by a virus that causes him to change from man to werewolf and back aga

S3·E3 Core

The Day the World Ended

Oct 2, 1966

As Admiral Nelson demonstrates a new tracking device for a visiting U.S. senator, it seems to show that Seaview is the only life left on earth.

S3·E4 Core

Night of Terror

Oct 9, 1966

Captain Crane searches for a lost diving bell containing Admiral Nelson, Chief Sharkey, and Dr. Sprague.

S3·E5 Core

The Terrible Toys

Oct 16, 1966

Seaview is investigating a UFO. Along the way, they pick up a shipwrecked old man -- almost always a bad omen when our gallant crew finds a castaway! The bedraggled fellow has a sa

S3·E6 Core

Day of Evil

Oct 23, 1966

A UFO crashes and an alien assumes the form of Admiral Nelson.

S3·E7 Core

Deadly Waters

Oct 30, 1966

Captain Crane rescues a diver from a wrecked atomic sub. He turns out to be Kowalski's brother, Stan, a Navy diving specialist. When the Seaview needs his help in getting off the o

S3·E8 Core

Thing From Inner Space

Nov 6, 1966

Bainbridge Wells is filming a segment of his "Science On The Move" television series on a small island off the coast of Chile. A sea creature comes ashore and kills his crew. Wells

S3·E9 Core

The Death Watch

Nov 13, 1966

Admiral Nelson and Captain Crane are involved in a mind-control experiment, with Chief Sharkey caught in the middle.

S3·E10 Core

Deadly Invasion

Nov 20, 1966

Faceless aliens invade Earth and try to take over an underwater atomic base. The leader takes the form of an old, deseased friend of Admiral Nelson in order to convice Nelson they

S3·E11 Core

The Haunted Submarine

Nov 27, 1966

A ghostly ancestor of Admiral Nelson visits him aboard Seaview.

S3·E12 Core

The Plant Man

Dec 4, 1966

Twin scientists - one good, one evil - come aboard Seaview. The evil twin is out to create a radioactive "plant man."

S3·E13 Core

The Lost Bomb

Dec 11, 1966

Seaview and an enemy sub battle to recover a superbomb from the ocean floor.

S3·E14 Core

The Brand Of The Beast

Dec 18, 1966

While racing to help a foundering research vessel, the Seaview's nuclear reactor goes critical. Admiral Nelson's right hand is exposed to intense radiation as he fixes the problem,

S3·E15 Core

The Creature

Jan 1, 1967

The Seaview is called in to help track an artificially created life form, now loose in the Pacific. The creature, which is growing at a fantastic rate, has its own agenda -- starti

S3·E16 Core

Death from the Past

Jan 8, 1967

As World War II draws to a close, a secret underwater Nazi base is damaged during a sea battle. A Nazi scientist and his aide are accidently put in suspended animation. Thirty-fi

S3·E17 Core

The Heat Monster

Jan 15, 1967

Arctic Listening Station XZ-5 receives a message from a voice from space (""laser beeeeeam""). Professor Bergstrom, ignoring the advice of his assistant, activates their beam and b

S3·E18 Core

The Fossil Men

Jan 22, 1967

The crew of a lost submarine returns as rock men to menace the Seaview. A new man, Kowalski's friend Richards, is captured on a diving mission and turned into a Fossil Man. Nelson

S3·E19 Core

The Mermaid

Jan 29, 1967

As the Seaview conducts a marine census, Captain Crane spots a mermaid. He brings her aboard and falls under her spell. A sea creature follows the mermaid and proceeds to cause big

S3·E20 Core

The Mummy

Feb 5, 1967

The Seaview is on a top secret mission to transport a 3,000 year old sarcophagus from New York to a country in the Middle East. The United States hopes that by returning a national

S3·E21 Core

Shadowman

Feb 12, 1967

The Seaview takes on a skeleton crew and is being used to guide a new interstellar space probe. However, Chip Morton is taken over by an alien shadow man which wants to stop the pr

S3·E22 Core

No Escape from Death

Feb 19, 1967

While searching the deep for an enemy complex, the Seaview is rammed by another sub. The crew rushes to make repairs before the air runs out and a lurking monster swallows a diving

S3·E23 Core

Doomsday Island

Feb 26, 1967

While Nelson and Sharkey search by air for an uncharted island, Seaview brings aboard a gigantic egg from the bottom of the sea during a routine specimen collection. It later hatch

S3·E24 Core

The Wax Men

Mar 5, 1967

The Seaview is carrying Atlantanean statues in its missile room as a favor for the State Department. As they wait for Captain Crane to return, a midget clown emerges from one of th

S3·E25 Mytharc

Deadly Cloud

Mar 12, 1967

A mysterious cloud is enveloping the Earth and causing massive Tsunami and other catastrophic environmental damage. Crane takes the flying sub in to find out the cause and is taken

S3·E26 Mytharc

Destroy Seaview!

Mar 19, 1967

Admiral Nelson has been brainwashed. After getting a vital energy source, he attempts to kill Crane and the visiting Dr. Land in an undersea cave. He then returns to the sub, gasse