An alien boy is sent to Priplanis to validate his prince status. Will is drawn into a battle to the death unbeknowest to his father. Once his real intentions are known John substitutes himself in the challenge and the Alien Ruler substitutes himself for his son.
| Creator | Irwin Allen |
|---|---|
| Actor | Guy Williams, June Lockhart, Mark Goddard |
| Country | United States of America |
| Production | Irwin Allen Productions |