The BEST Episodes of Lost in Space

Every episode ever - ranked by fan votes!

Last Updated: May 23, 2021

Network: CBS

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.

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Follow the Leader

#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.

star 7.86
37 votes
Directors: Don Richardson
Writers: Barney Slater
The Challenge

#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.

star 7.76
34 votes
Directors: Don Richardson
Writers: Barney Slater
The War of the Robots

#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.

star 7.74
46 votes
Directors: Sobey Martin
Writers: Barney Slater
The Golden Man

#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.

star 7.61
28 votes
Directors: Don Richardson
Writers: Barney Slater
Wish Upon a Star

#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.

star 7.61
56 votes
Directors: Sutton Roley
Writers: Barney Slater
Target Earth

#6 - Target Earth

Season 3 - Episode 16 - Aired Jan 3, 1968

Will tries to brew dissension among shapeless aliens who plan to conquer Earth.

star 7.54
28 votes
Directors: Nathan Juran
Writers: Peter Packer
Ghost in Space

#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.

star 7.53
38 votes
Directors: Sobey Martin
Writers: Barney Slater
Hunter's Moon

#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.

star 7.52
23 votes
Directors: Don Richardson
Writers: Jack Turley
The Anti-Matter Man

#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.

star 7.50
14 votes
Directors: Sutton Roley
Writers: Barney Slater, Robert Hamner
The Sky is Falling

#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.

star 7.50
76 votes
Directors: Sutton Roley
Writers: Barney Slater, Herman Groves
Return from Outer Space

#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.

star 7.48
87 votes
Directors: Nathan Juran
Writers: Peter Packer
Trip Through the Robot

#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.

star 7.48
27 votes
The Magic Mirror

#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.

star 7.46
35 votes
Directors: Nathan Juran
Writers: Jackson Gillis
Invaders from the Fifth Dimension

#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.

star 7.45
84 votes
Directors: Leonard Horn
Writers: Shimon Wincelberg
Visit to a Hostile Planet

#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.

star 7.45
40 votes
Directors: Sobey Martin
Writers: Peter Packer
My Friend, Mr. Nobody

#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.

star 7.43
84 votes
Directors: Paul Stanley
Writers: Jackson Gillis
Space Creature

#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.

star 7.41
27 votes
Directors: Sobey Martin
Writers: William Welch
The Flaming Planet

#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.

star 7.39
28 votes
Directors: Don Richardson
Writers: Barney Slater
The Sky Pirate

#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.

star 7.39
31 votes
Directors: Sobey Martin
Writers: Carey Wilber, Carey Wilbur
The Hungry Sea

#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.

star 7.39
101 votes
The Keeper (1)

#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.

star 7.38
52 votes
Directors: Harry Harris
Writers: Barney Slater
The Cave of the Wizards

#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.

star 7.36
22 votes
Directors: Don Richardson
Writers: Peter Packer
Wreck of the Robot

#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.

star 7.35
57 votes
Directors: Nathan Juran
Writers: Barney Slater
The Keeper (2)

#24 - The Keeper (2)

Season 1 - Episode 17 - Aired Jan 19, 1966

The Robinsons must turn Penny and Will over or face death.

star 7.35
43 votes
Directors: Harry Harris
Writers: Barney Slater
Curse of Cousin Smith

#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.

star 7.32
60 votes
Directors: Justis Addis
Writers: Barney Slater