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First Season Episodes - One Of Our Dogs Is Missing (episode 13)


A spaceship carrying a dog crashes on the Robinson's planet where the canine is instrumental in leading John and Don to save Judy from the clutches of a mutant creature.

A sudden and violent meteor storm causes loss of radio contact between the Jupiter 2 and the Chariot as John, Will and Don travel through the night to build a microwave relay station. The next morning, Penny discovers a wrecked space capsule nearby. Smith believes it to be a sign of an impending invasion. 

Back at the Jupiter 2, the family discovers that their food supply has been pillaged. In the morning, the group searches for the source of a strange howling noise. They discover a friendly little dog, which they assume was the cause of the disturbance. Concerned by a patch of fur which does not match the dog's coat, Maureen and Judy discover notes in John's files pertaining to the possible existence of mutant creatures which exist on the planet in a state of metamorphosis. 

The situation quickly deteriorates as Judy discovers the force field is not working, then while she works on it, the dog mistakes her laser gun for a stick and runs off with it. Unseen nearby, a mutant observes the Jupiter 2 campsite. As Judy searches for her gun, Maureen discovers to her horror that Smith has dismantled the entire arsenal for cleaning purposes. Penny returns to the spaceship and Judy agrees to have a crack at searching for the dog. 

When the men return and discover Judy missing, John and Don search for her. Smith decides to form a posse to go after what he thinks is the dog-spy, and he deputizes Will and the Robot. Judy, meanwhile, has confronted and fled from the awful mutant. The dog leads John and Don to her and as the creature closes in on the exhausted girl, John blasts it with a laser gun. Don scoops Judy into his arms and heads back to the ship. 

But now, Smith has found the dog's location and he sends Will ahead to kill it. But the boy cannot bring himself to shoot the friendly creature. As John comes upon boy and dog, he is attacked by the mutant. Will blasts the creature with the gun meant for the dog. 

The next day, as John works on the laser drill, a vine-like growth wraps around his leg and pulls him toward the bog.

Filming

Cast
Professor John RobinsonGuy Williams
Maureen RobinsonJune Lockhart
Major Don WestMark Goddard
Judy RobinsonMarta Kristen
Penny RobinsonAngela Cartwright
Will RobinsonBilly Mumy
Dr. Zachary SmithJonathan Harris
RobotBob May
Voice of the RobotDick Tufeld
Production
Executive ProducerIrwin Allen
DirectorSutton Roley
WriterWilliam Welch
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