2x1 - Flowers of Death

January 5, 1952

2x2 - Cosmic Smoke Guns

January 12, 1952

2x3 - Lost in the Snow Cap Region of Mars

January 19, 1952

2x4 - Explosion on Morehouse Five

January 26, 1952

2x5 - The Evil Guardian of Harpola

February 2, 1952

2x6 - Hit by a Meteorite

February 9, 1952

2x7 - Planetoid Plot

February 16, 1952

2x8 - Victim of Amnesia

February 23, 1952

2x9 - The Lieutenant's Revenge

March 1, 1952

2x10 - The Mind Readers

March 8, 1952

2x11 - Slaves of the Exonium Mine

March 15, 1952

2x12 - Abandoned in Outer Space

March 22, 1952

2x13 - The Great Bank Robbery

March 29, 1952

2x14 - The Mysterious Moonquakes

April 5, 1952

2x15 - The Phantom Fleet

April 12, 1952

2x16 - Trouble on Titan

April 19, 1952

2x17 - Sacrifice to the Moon God

April 26, 1952

2x18 - Uncertain Death

May 3, 1952

2x19 - nvasion

May 10, 1952

2x20 - A Threat to the United Planets

May 17, 1952

2x21 - The Threat of the Thormanoids

May 24, 1952

2x22 - Jungle Jeopardy

May 31, 1952

2x23 - The Scheming Sibling

June 7, 1952

2x24 - Danger on Mars

June 14, 1952

2x25 - Mission to Mercury

June 21, 1952

2x26 - The Deadly Ray Gun

June 28, 1952

2x27 - The Force Barrier

July 5, 1952

2x28 - The Iron Fist

July 12, 1952

2x29 - The Derelict Space Station

July 19, 1952

2x30 - The Mystery of Ancient Egypt

July 26, 1952

2x31 - Mystery of the Pirate Ship

August 2, 1952

2x32 - Emergency Flight to Mercury

August 9, 1952

2x33 - Blackmail at Lake Azure

August 16, 1952

2x34 - The Hidden Map

August 23, 1952

2x36 - The Galaxtic War

September 6, 1952

2x37 - The Energy Thief

September 13, 1952

2x38 - Sabotage of the Jupiter Run

September 20, 1952

2x39 - The Star Raiders

September 27, 1952

2x40 - The Code Breakers

October 4, 1952

2x41 - Errand of Mercy

October 11, 1952

The crew miscalculates, and instead of going back in time to 1952, they end up in Nazi Germany in 1942 in the middle of a world war.

2x42 - Underwater Treachery

October 18, 1952

2x43 - The Electronic Man

October 25, 1952

2x44 - Treachery on Terra Five

November 1, 1952

2x45 - Frontier Epidemic

November 8, 1952

2x46 - Powerdive

November 15, 1952

2x47 - Three Exiles

November 22, 1952

2x48 - The Shakedown

November 29, 1952

2x49 - The Human Trap

December 6, 1952

2x50 - The Chase in Time

December 13, 1952

2x51 - The Deadly Sunbeam

December 20, 1952

2x52 - The Conspiracy

December 27, 1952