The Series

After a promising start as a true science-fiction ensemble piece, the second season became more of a camp parody of science fiction, a response to the overwhelming success of arch-rival series Batman. By third season, it was evident from the ratings that another change was needed, and the show began to slowly shift back toward "serious" science fiction. But too little too late to extend the show for a fourth season.

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First Season	Season opens with Judy Robinson as a useful and active member of the cast - helping with ship operations, aiding in rescues, and of course, flirting with Don West. As Smith begins to evolve from menace to nuisance, other cast members, most notably Judy, begin to see less and less utilization.
Episode	Original Airdate	Notes & Synopses
No Place to Hide The Reluctant Stowaway	Unaired pilot 15 September 1965	See review See review
The Derelict	22 September 1965	After an encounter with a rare heat producing comet, the battered J-2 encounters a massive ship with extensive navigational maps. Problem is, the ship in not uninhabited after all.
Island in the Sky	29 September 1965	The J-2 lands on a planet to effect repairs. John gets to play with the para-jets, the Chariot is assembled, and the crew finally gets out the silver suits!
There Were Giants In The Earth	06 October 1965	Professor Robinson discovers the soil of this new planet contains a parasitic virus that mutates the host organism. The result? Accelerated growth, such as found in a 16-meter cyclopean monster!
The Hungry Sea	13 October 1965	The elliptical orbit of this planet first threatens to freeze then incinerate the Robinsons.
Welcome Stranger	20 October 1965	Long lost astronaut Jimmy Hapgood lands on the planet, and could take Will & Penny back to earth.
My Friend, Mr. Nobody	27 October 1965	A lonely Penny invents an invisible friend. Or is it a dangerous alien force?
Invaders From The Fifth Dimension	03 November 1965	Dr. Smith coerces Will into volunteering his brain to power an alien interdimensional craft
The Oasis	10 November 1965	The drought worsens as temperatures soar. An alien fruit carrying the same metamorphic parasite is accidentally eaten by Smith, causing him to mutate into a giant.
The Sky is Falling	17 November 1965	Aliens arrive, who do not communicate in a way comprehensible to humans. Are they fellow colonists or vanguards of an invading army?
Wish Upon a Star	24 November 1965	Smith stumbles upon an alien device that converts thoughts and desires in reality. Will greed destroy the Robinson?
The Raft	01 December 1965	Unable to launch the Jupiter-2, the Robinsons plan to launch a small craft, piloted by Major West back to Earth for help. Will and Smith end up in the vessel, but it may not be Earth they land upon.
One Of Our Dogs Is Missing	08 December 1965	A dog launched in a prototype space capsule is found. But is the dog actually an alien threat?
Attack of the Monster Plants	15 December 1965	Giant cyclamen plants create a duplicate Judy to steal the deutronium fuel.
Return From Outer Space	29 December 1965	Will is transported back to Earth, but no one believes who he is.
The Keeper (2 parts)	12 & 19 January 1966	An intergalactic collector puts Will and Penny into his collection!
The Sky Pirate	26 Jan 1966	Will befriends a space pirate, who is being pursued by a creature from another galaxy.
Ghost In Space	02 February 1966	An invisible, destructive force that threatens the Robinsons. While the Robinsons figure out how to nullify it, Smith tries to exorcise it.
The War Of The Robots	09 February 1966	The Robinson repair a robot, unaware it is evil. Robby the Robot guest stars.
The Magic Mirror	16 February 1966	Penny and the Bloop fall through an alien mirror into another dimension.
The Challenge	02 March 1966	An alien and his son challenge John and Will to a test of strength and courage.
The Space Trader	09 March 1966	The Robinson's food supply is destroyed, and a hungry Smith cuts a very bad deal with a space merchant.
His Majesty Smith	16 March 1966	Smith is selected to be king of an alien civilization.
The Space Croppers	30 March 1966	Smith woos the matriarch of a clan of space hillbillies.
All That Glitters	06 April 1966	Penny and Smith acquire a neck-ring that turns anything the wearer touches into platinum, including Penny.
The Lost Civilization	13 April 1966	Will must marry a princess he kissed and awoke from suspended animation.
A Change Of Space	20 April 1966	Will returns from a FTL trip into the 6th dimension with his intelligence greatly enhanced.
Follow The Leader	27 April 1966	John Robinson is possessed by the spirit of a cruel alien warrior.
Second Season	Season opens
Blast Off Into Space	04 September 1966	The Robinsons prepare for a quick takeoff when a spacer miner causes a chain-reaction of earthquakes that will disintegrate the planet.
Wild Adventure	21 September 1966	A green lorelei hypnotizes Smoth into dumping the J2's fuel.
The Ghost Planet	28 September 1966	The Robinsons land on a planet of robots who enslave organic lifeforms.
The Forbidden World	05 October 66	Smith, Will and the Robot are captured by hermit and his giant bird, who plan to mobilize an army to destroy the Jupiter 2.
Space Circus	12 October 1966	Will plans to runaway with a traveling space circus.
The Prisoners Of Space	19 October 1966	An outer space court accuses the Robinsons of numerous crimes and offenses during their journey.
The Android Machine	26 October 1966	Smith accidentally orders an android from an alien catalogue.The Robinsons teach it to be human. Unfortunately, payment is now due on the purchase.
The Deadly Games Of Gamma 6	02 November 1966	In order to save Earth from invasion, John must survive an alien version of Russian Roulette.
The Thief From Outer Space	09 November 1966	Look for a treasure map, a space thief captures Will, Penny, and Smith.
Curse Of Cousin Smith	16 November 1966	Smith's cousin Jeremiah conspires with an intergalactic Mafia to murder Dr. Smith.
West Of Mars	30 November 1966	A space desperado, Smith's exact duplicate, forces Smith to impersonate him.
A Visit To Hades	07 December 1966	Judy and Don descend to Hell to rescue Smith.
The Wreck Of The Robot	14 December 1966	Aliens steal and disassemble the B9.
The Dream Monster	21 December 1966	To make his android more "human", a scientist drains all emotions from the Robinsons.
The Golden Man	28 December 1966	Two warriors seeking assistance land on the Robinson's planet, one golden and handsome, one hideous and rude.
The Girl From The Green Dimension	04 January 1967	Athena returns with a big, green suitor in hot pursuit. Pretty, handsome, brave, pretty Dr. Smith lands in a love triangle.
The Questing Beast	11 January 1967	A space knight arrives on the trail of a ferocious dragon he has chased across the cosmos.
The Toymaker	25 January 1967	Smith is transformed into a clown, and put into a toy department. Will and the Robot attempt a rescue, and discover a passage back to Earth.
Mutiny In Space	01 February 1967	Will, Smith, and the Robot are shanghaied by a space pirate captain.
The Space Vikings	08 February 1967	Dr. Smith steals the gloves and hammer of Thor. The God of Thunder wants them back.
Rocket To Earth	15 February 1967	Smith befriends a space magician, hoping to steal his spaceship and return to Earth.
The Cave Of The Wizards	22 February 1967	A computer traps Smith, gradually takes over his mind and body.
Treasures Of The Lost Planet	01 March 1967	A cybernetic head mistakes Dr. Smith for its master and tries to lead him to a priceless hidden treasure. Can space pirates be far behind?
Revolt Of The Androids	08 March 1967	Android Verda returns, pursued by an android with orders to decommission her.
The Colonists	15 March 1967	The Robinsons are captured by Space Amazons. The men are forced to work while the women disappear from the script.
Trip Through The Robot	22 March 1967	The Robot is transformed into a giant. Will and Smith recreate "Fantastic Voyage." sans Raquel Welch..
The Phantom Family	29 March 1967	See review
The Mechanical Men	05 April 1967	Tiny warrior robots decide that the Robinson Robot is their long lost leader.
The Astral Traveller	12 April 1967	Will passes through a space warp into 19th-century Scotland, where a ghost and a monster inhabit an old castle.
The Galaxy Gift	26 April 1967	Penny's must either watch her family die or give up an amulet an alien warned her not to.
Third Season	Season opens
The Condemned Of Space	07 September 1967	J2 lands on a cryogenic prison. Smith releases a prisoner. A riot ensues. Robby the Robot guest stars.
Visit To A Hostile Planet	13 September 1967	See review
Kidnapped In Space	20 September 1967	Warrior androids coerce the robot into operating on their leader. John is killed and Smith is changed into a 9 year old.
Hunter's Moon	27 September 1967	"Most Dangerous Game" ala LIS. John kills a creature who was the quarry of Megazor and is forced to become the hunted.
The Space Primevals	04 October 1967	Don and Smith, enroute to cap a volcano, are captured by computer worshipping space Neanderthals. John, Will and the Robot attempt a rescue.
The Space Destructors	11 October 1967	Smith finds a device and makes an army of look-alike soldiers to conquering the galaxy. Will falls into the machine, and ends up with Smith's face. Guy Williams duels!
The Haunted Lighthouse	18 October 1967	Penny meets a Peter Pan-like alien. The J2 encounters a lightship from Earth. Judy gets to help steer J2. Lions threaten Will. Cosmic Storms threaten all.
Flight Into The Future	25 October 1967	See review
Collision Of The Planets	08 November 1967	Space biker hippies are send to destroy the planet without giving the Robinsons time to repair J2 and leave. Smith is transformed into a greenhaired Samson.
The Space Creature	15 November 1967	Jupiter 2 is locked into orbit around a planet which harbors a creature that feeds on fear.
Deadliest Of The Species	22 November 1967	The robot meets one of his own kind. Unfortunately, she is evil incarnate. Sparks fly as robot romance and mayhem ensures.
A Day at the Zoo	29 November 1967	See review
Two Weeks In Space	13 December 1967	Smith and Will are left to watch the J2 while everyone else is on a mission. Escaped criminals end up in as guests in the J2 as Smith turns it into a resort hotel.
Castles In Space	20 December 1967	See review
Anti-Matter Man	27 December 1967	Mark Goddard considers this one of his best as he and Guy Williams do double duty as their evil nterdimensional dopplegangers.
Target: Earth	03 January 1968	Amorphous clay creatures reprogram the robot, imprison and make duplicates of the Robinsons. It is the vanguard to an invasion of Earth. Will and Smith replace their replacements.
Princess of Space	10 January 1968	Penny is mistaken for the lost heir to the throne of the planet Beta.
The Time Merchant	17 January 1968	Smith returns to 1997 on the eve of the launch of the J2. If he fails to be aboard at launch, the Robinsons will die. The robot is sent back to get him on the ship.
The Promised Planet	24 January 1968	J2 lands on a planet run by 1960's teenagers. Soon, Penny is a go-go dancer, John and Maureen think Judy is an only child, Smith is a hippie and Will is the squaresville key to escape.
Fugitives In Space	31 January 1968	Smith and West are convicted of helping an escaped criminal and sent to Destruction, the toughest penal planet in the quadrant. Robot and Will attempt a rescue.
Space Beauty	14 February 1968	See review
The Flaming Planet	21 February 1968	A giant parthogenic plant and the last of a warrior race threaten the ship.
The Great Vegetable Rebellion	28 February 1968	See review
Junkyard Of Space	06 March 1968	The J2 is trapped on a junk planet in space. With supplies contaminated, Smith begins trading parts of the robot for food. On the last broadcast episode of the series, we get to see the pod, the chariot and the jetpack one last time.

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