Two time travelers from 5477 come to the Land of the Giants to conquer Earth.
Originally aired: December 7, 1969 on ABC
Writer: William Welch
Director: Harmon Jones
Show Stars: Don Marshall (Dan Erickson), Deanna Lund (Valerie Ames Scott), Heather Young (I) (Betty Hamilton), Gary Conway (Captain Steve Burton), Stefan Arngrim (Barry Lockridge), Don Matheson (Mark Wilson), Kurt Kasznar (Commander Alexander B. Fitzhugh)
Guest Stars: Warren Stevens (Olds) , Rex Holman (Mezron) , Jerry Douglas (Fielder) , Jerry Quarry (Bron) , Scott Thomas (Messenger) , Jon Mooney (Pharmacist) , Gene LeBell (Mezron's Brother)
Production Code: 4708
Two time travelers from Earth in the year 5477 travel back in time. One of them, Olds, has plans for ruling the universe. They disguise themselves as naval officers from Earth (based on Fitzhugh's uniform).
Then...a lot of stuff happens. The travelers kill a criminal giant who spots them, leading two others to start searching. Steve is suspicious of these new arrivals, so they capture him. Then they capture Dan. Then they convince Mark and Betty to help them find someplace where they can stash a hundred people. Steve and Dan steal some truth serum, and manage to use it on Olds despite his protective force field. They find out his plan and get hold of his control medallion, and Steve is also contacted by another time traveler from the future sent back to try and stop the first two.
Olds recovers the medallion, but Steve convinces him he can read minds by relating some of the information he gained from the drugged Olds. Mark is almost caught by the two searching giants, and the renegade time travelers kill those two giants as well. The second traveler, Fielder, is accidentally killed by Olds, and then Olds is captured before he can initiate his evil scheme to use the Land of the Giants as his base for his followers (all 100 of them) to take over the universe.
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