The BEST Episodes of Lost in Space
Every episode ever - ranked by fan votes!
Last Updated: May 23, 2021
The space family Robinson is sent on a five-year mission to find a new planet to colonize, but the voyage is sabotaged time and again by an inept stowaway, Dr. Zachary Smith. The family's spaceship, Jupiter II, also carries a friendly robot who endures an endless stream of abuse from Dr. Smith, but is a trusted companion of young Will Robinson.
#1 - Follow the Leader
Season 1 - Episode 29 - Aired Apr 27, 1966
John falls into a cave containing a centuries-old mummy, whose spirit possesses John’s body.
#2 - The Challenge
Season 1 - Episode 22 - Aired Mar 2, 1966
The Robinsons encounter a militant boy who is determined to prove his superiority over the earthlings.
#3 - The War of the Robots
Season 1 - Episode 20 - Aired Feb 9, 1966
Will finds a rusted, more capable robot, but the Robinsons’ own robot warns him against rebuilding the device.
#4 - The Golden Man
Season 2 - Episode 15 - Aired Dec 28, 1966
The Robinson women and Dr Smith become involved in a war between the leaders of two alien civilizations.
#5 - Wish Upon a Star
Season 1 - Episode 11 - Aired Nov 24, 1965
Will and Dr. Smith discover a device that transforms wishes into realities.
#6 - Target Earth
Season 3 - Episode 16 - Aired Jan 3, 1968
Will tries to brew dissension among shapeless aliens who plan to conquer Earth.
#7 - Ghost in Space
Season 1 - Episode 19 - Aired Feb 2, 1966
Smith sets off an explosion in a bog, arousing an invisible, indestructible, and irresistible, creature.
#8 - Hunter's Moon
Season 3 - Episode 4 - Aired Sep 27, 1967
John is captured by a maniacal humanoid and made the quarry in a sadistic big-game hunt.
#9 - The Anti-Matter Man
Season 3 - Episode 15 - Aired Dec 27, 1967
Will and the robot try to rescue the kidnapped Prof. Robinson in a macabre world of orange grass, polka-dotted leaves, and animated rocks.
#10 - The Sky is Falling
Season 1 - Episode 10 - Aired Nov 17, 1965
The Robinsons encounter a family of crablike visitors who are far from friendly.
#11 - Return from Outer Space
Season 1 - Episode 15 - Aired Dec 29, 1965
Will disobeys John’s orders to stay away from the matter-transfer unit and is transported back to Earth.
#12 - Trip Through the Robot
Season 2 - Episode 26 - Aired Mar 22, 1967
Will and Dr. Smith try to repair the robot, which has grown to the size of a house.
#13 - The Magic Mirror
Season 1 - Episode 21 - Aired Feb 16, 1966
Penny discovers an extraordinary mirror which reflects a world that does not exist.
#14 - Invaders from the Fifth Dimension
Season 1 - Episode 8 - Aired Nov 3, 1965
The travelers are menaced by glowing creatures who are looking for a humanoid brain.
#15 - Visit to a Hostile Planet
Season 3 - Episode 2 - Aired Sep 13, 1967
A time warp transports the travelers to a hostile planet – Earth as it was in 1947.
#16 - My Friend, Mr. Nobody
Season 1 - Episode 7 - Aired Oct 27, 1965
Penny discovers a deep cave inhabited by an invisible but seemingly friendly voice.
#17 - Space Creature
Season 3 - Episode 10 - Aired Nov 15, 1967
A blue mist causes the travelers to disappear one by one until only Will is left.
#18 - The Flaming Planet
Season 3 - Episode 22 - Aired Feb 21, 1968
The Robinsons must contend with a rapidly growing plant and missiles fired by aliens.
#19 - The Sky Pirate
Season 1 - Episode 18 - Aired Jan 26, 1966
The Robinsons meet a space traveling Earth man, Alonzo P. Tucker, who was abducted by aliens in 1876.
#20 - The Hungry Sea
Season 1 - Episode 5 - Aired Oct 13, 1965
An earthquake threatens to seal the cave where Don, Judy, Will, and Penny are trapped.
#21 - The Keeper (1)
Season 1 - Episode 16 - Aired Jan 12, 1966
The castaways’ planet is visited by a being traveling the universe to collect creatures—two of every kind.
#22 - The Cave of the Wizards
Season 2 - Episode 22 - Aired Feb 22, 1967
Smith is lured into a tomblike cave, where he falls under the spell of a computer.
#23 - Wreck of the Robot
Season 2 - Episode 13 - Aired Dec 14, 1966
The robot is being used to help create a sinister army of machines.
#24 - The Keeper (2)
Season 1 - Episode 17 - Aired Jan 19, 1966
The Robinsons must turn Penny and Will over or face death.
#25 - Curse of Cousin Smith
Season 2 - Episode 10 - Aired Nov 16, 1966
Jeremiah Smith plots to liquidate his doctor cousin and claim the family fortune.