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Plants grow to huge proportions and can duplicate any item placed in them - but those items are made of plant material and are useless. John Robinson must use the biggest batch of plant killer he's ever mixed up to stop these things from engulfing the spaceship.
Episodes
1The Reluctant Stowaway 2The Derelict 3Island in the Sky 4There Were Giants in the Earth 5The Hungry Sea 6Welcome Stranger 7My Friend, Mr. Nobody 8Invaders from the Fifth Dimension 9The Oasis 10The Sky Is Falling 11Wish Upon a Star 12The Raft 13One of Our Dogs Is Missing 14Attack of the Monster Plants 15Return from Outer Space 16The Keeper (1) 17The Keeper (2) 18The Sky Pirate 19Ghost in Space 20War of the Robots 21The Magic Mirror 22The Challenge 23The Space Trader 24His Majesty Smith 25The Space Croppers 26All That Glitters 27The Lost Civilization 28A Change of Space 29Follow the Leader