The Robinson’s camp is breached by a twelve-year-old boy carrying a spear called Quano (played by a young Kurt Russell). He says he is preparing to undergo a series of challenges intended to test whether he has the courage and strength necessary to be a worthy successor to his father, known as The Leader, back on his home planet.
Quano sees Will holding a watering can to tend to a flower garden and derides him for doing what he calls ‘women’s work’. When Will collects geological samples for his rock collection Quano accuses him of being ‘unmanly’. Will responds by saying he’ll take brains over brawn any day.
Quano soon challenges Will to compete in a series of contests to determine who is the stronger and more skilled. Eventually Will accepts the challenge. Smith overhears Quano and his father planning for the upcoming event. Quano’s father says that if Quano loses the victor and all witnesses must be destroyed.
Smith then employs various means, including training Will to exhaustion so he will have no energy left for the challenge, designed to ensure Will loses. A series of physical challenges between the two boys then begins. The result is a tie with one event to go. Fearing his son may lose, Quano’s father proposes he and Professor Robinson compete against each other in place of their sons for the final event.
The final challenge involves the use of Volta blades (electrified fencing). Smith watches on while all the time using a stethoscope to monitor his racing heartbeat. Professor Robinson comes out on top (no surprise for someone who played ZORRO for three seasons. (1957 -1959). When Quano’s father congratulates Professor Robinson on his victory, John responds – “Thank you. But don’t ask me to do it again.”