Three giants transport four of the travelers to a distant land; guest Albert Salmi.
Steve and Dan are given the chance to relive the hours before their ill-fated flight.
In return for his help, the travelers improve a puppeteer's (Frank Ferguson) act.
The travelers battle a giant boy's radio-controlled toy army.
The travelers uncover a plot to set off bombs within a city; guest Francine York.
The travelers hope to use an inventor's transporting device to return home.
War looms between the surface-dwelling giants and others who live underground; guest Malachi Throne.
A giant piper (Jonathan Harris) tries to collect a reward for capturing the travelers.
Radiation from Dan's new power device causes hallucinations and makes the travelers invisible.
A superstitious giant (Alan Hale) believes the travelers are leprechauns.
A toy balloon carries four of the travelers to a land ruled by an evil despot (Nehemiah Persoff).
The travelers battle two ruthless Earthmen (Warren Stevens, Jerry Douglas) from the year 5477.
A scientist (William Schallert) makes exact duplicates of four of the travelers.
The travelers try to help a despondent giant (John Carradine) make a movie comeback.
In rescuing Fitzhugh from a wax museum, the travelers face jewel thieves.
The travelers are in danger when Chipper must go to the vet for an operation.
A giant (Guy Stockwell) plans to use Valerie in a plot to murder his rich uncle.
To free Barry and Valerie, Dan must coach a giant trumpet-player (Sugar Ray Robinson).
Toxic toadstool spores transform Steve into a dangerous paranoid.
The travelers are strapped to chess pieces and forced to play for their lives.
Fitzhugh's love of gambling leads the travelers to a scheme to fix a horse race; guest Vic Tayback.
The travelers have only six hours to clear a condemned giant of murder.
A giant scientist (Broderick Crawford) wants Mark to figure out why a robot is malfunctioning.
Kobick forces the travelers to help him capture underground freedom workers.
The travelers build a hearing aid for a deaf, giant boy in exchange for their freedom.
The travelers are caught in a power struggle between two giants.
Feeling responsible, the travelers try to rescue two giant children trapped in a shaft.
The travelers help a giant magician (Jack Albertson) clear himself of involuntary manslaughter.
An experimental formula makes Fitzhugh giant-sized; guest Ron Howard.
Mark bargains with a scientist to trade his technical skills for a ride back to Earth.
The remaining travelers help captured comrades escape from a zoo.
Two giant orphans mistake Fitzhugh for a magic elf that grants wishes.
Kobick develops a new device which detects a metal known only to Earthlings.
A giant scientist (Michael Ansara) pursues the travelers.
A bounty hunter seeks a reward for the travelers.
Brainwashed Steve may reveal the location of a transmitter linked to Earth; guest Warren Stevens.
The travelers meet teen delinquents lost while circling Earth two years before.
The giants use a captured girl (Celeste Yarnall) as bait to lure Mark.
The travelers find a survivor (Glenn Corbett) of an early experimental spaceflight.
Giant thieves want Fitzhugh to help them steal a ruby from a museum.
When Barry needs an appendectomy, Steve receives unexpected help from a giant doctor.
Fuel cells must be sacrificed to rescue the captured women.
A giant convict (John Napier) grabs the spaceship then is caught in quicksand.
A giant, miniaturized by pills, tries to use the travelers to obtain knowledge from Earth.
A giant Gypsy captures Fitzhugh and Barry and plans to sell them to a circus.
A giant professor needs the travelers' help to destroy an incriminating envelope.
Steve and Fitzhugh witness a murder and then struggle to prove the innocence of the hobo who has been set-up for the crime.
The space travelers are tormented by a giant girl when they become trapped in the miniature town built by her grandfather.
A London-bound flight in 1983 passes through a space warp and crashes on a world where everything is huge.