Synopsis by Hal Erickson
A fifteen-year-old Kurt Russell appears in this episode as Quano, the 11-year-old prince of a faraway planet. Accompanied by his father, the Ruler (Michael Ansara), Quano arrives on the Robinsons' planet, where the two aliens challenge John (Guy Williams) and Will (Bill Mumy) to a test of superiority. The two Robinson men accept the challenge, little realizing that if they win, the rest of their family loses. . .their lives! This episode allows Guy Williams to show off the swordfighting prowess that had distinguished his previous TV stint as Zorro.