1x1 - A Man Called Guppy

January 1, 1965

1x2 - The Loss of the Argonaut

1x3 - Mission: Thunder Fire Island

1x4 - One for the Money, One for the Show

1x5 - The Ice Trap

Pirates rescued from a life raft hijack a freighter and force the crew to take them to a deep sea mining operation where they steal a shipload of valuable uranium ore. Captain Fathom and his crew are ordered to recapture the vessel, free the crew and return the ore before it winds up in the hands of an unfriendly nation.

1x6 - Wanted Dead or Alive

1x7 - The Light That Wailed

1x8 - The Underseas Land Grab

1x9 - The Shrieking Mountain

1x10 - Find a Hidden Prize

1x12 - Pursuit of the Dinopisces

1x13 - The Sub-Enchanted Garden

1x14 - Rustlers of the Sea Range

1x15 - Voyage to the Stone Age

1x16 - The Baron of Shark Island

1x17 - Ghost Ship

When the captain of several freighters who have wrecked on a treacherous reef report they swerved to avoid being rammed by a ghost ship, Captain Fathom and his crew are asked to investigate. When the salvage operator responsible for causing the wrecks discovers Fathom's presence, he determines to destroy the adventurer, his ship and crew with torpedoes and magnetic mines.

1x18 - The Whale and W.P.

1x19 - The Eye of the Mountain

1x20 - Xerog

1x21 - Project Meec

1x22 - Phantom of Port Royal

1x23 - Seldom Seem Sea Serpent

1x24 - Deep Marauder

1x25 - U-2 Rudolph

1x26 - Pisastro's Private War

Captain Fathom and the crew of the Argonaut are ordered to attend the signing of a peace treaty between two small peaceful island nations. When the chief of one of the islands accidentally sinks a boat belonging to the other archipelago, the peace treaty is off and war is on unless Fathom and his crew can avert disaster.