Season One:  (1965-66)

1-1   The Reluctant Stowaway
1-2   The Derelict
1-3   Island in the Sky
1-4   There Were Giants in the Earth
1-5   The Hungry Sea
1-6   Welcome Stranger
1-7   My Friend, Mr. Nobody
1-8   Invaders from the Fifth Dimension
1-9   The Oasis
1-10  The Sky Is Falling
1-11  Wish Upon a Star
1-12  The Raft
1-13  One of Our Dogs Is Missing
1-14  Attack of the Monster Plants
1-15  Return from Outer Space
1-16  The Keeper (1)
1-17  The Keeper (2)
1-18  The Sky Pirate
1-19  Ghost in Space
1-20  War of the Robots
1-21  The Magic Mirror
1-22  The Challenge
1-23  The Space Trader
1-24  His Majesty Smith
1-25  The Space Croppers
1-26  All That Glitters
1-27  The Lost Civilization
1-28  A Change of Space
1-29  Follow the Leader
 

Season Two:  (1966-67)

2-1   Blast Off into Space
2-2   Wild Adventure
2-3   The Ghost Planet
2-4   Forbidden World
2-5   Space Circus
2-6   The Prisoners of Space
2-7   The Android Machine
2-8   The Deadly Games of Gamma 6
2-9   The Thief from Outer Space
2-10  The Curse of Cousin Smith
2-11  West of Mars
2-12  A Visit to Hades
2-13  The Wreck of the Robot
2-14  The Dream Monster
2-15  The Golden Man
2-16  The Girl From the Green Dimension
2-17  The Questing Beast
2-18   The Toymaker
2-19   Mutiny in Space
2-20   The Space Vikings
2-21   Rocket to Earth
2-22   The Cave of the Wizards
2-23   Treasures of the Lost Planet
2-24   Revolt of the Androids
2-25   The Colonists
2-26   Trip Through the Robot
2-27   The Phantom Family
2-28   The Mechanical Men
2-29   The Astral Traveler
2-30   The Galaxy Gift

Season Three:  (1967-68)

3-1   Condemned of Space
3-2   Visit to a Hostile Planet
3-3   Kidnapped in Space
3-4   Hunter’s Moon
3-5   The Space Primevals
3-6   The Space Destructors
3-7   The Haunted Lighthouse
3-8   Flight into the Future
3-9   Collision of the Planets
3-10  The Space Creature
3-11  Deadliest of the Species
3-12  A Day at the Zoo
3-13  Two Weeks in Space
3-14  Castles in Space
3-15  The Anti-Matter Man
3-16  Target: Earth
3-17  Princess of Space
3-18  The Time Merchant
3-19  The Promised Planet
3-20  Fugitives in Space
3-21  Space Beauty
3-22  The Flaming Planet
3-23  The Great Vegetable Rebellion
3-24  Junkyard of Space