AllMovie

The Jupiter 2 lands on what appears to be an earth colony populated by swingin' teenaged hippies. In fact, these "flower children" are sinister aliens with mind-control powers, who plan to foment a youth rebellion by turning Penny (Angela Cartwright) and Will (Billy Mumy) against their parents. The episode's highlight the "makeover" of Dr. Smith (Jonathan Harris) as a green-haired hippie, replete with beads, psychedelic clothing and cool dance moves. (It's also amusing that the writer assumed that Hippiedom would still be in full force in 1999; who could have predicted the rise of Punkers and Goths!)