The starship Enterprise finds the SS Botany Bay carrying humans from the 21st Century. Spock is fascinated by Ruth, who was dipped in Venus fluid moments after her birth. Ship historian Lt. Marla McGivers becomes entranced by Kahn, who plans to use her to take over the ship. A Vulcan female called Chandra, who just happens to be suffering from Pon Far, beams aboard to warn Kirk about Kahn and 'the Craving'. Indeed, Kahn releases the PSI2000 virus into the ships ventilation system which brightens everyones pupils. Dr. McCoy concludes that the only antidote is to have a powerful orgasm as soon as possible.

It's the start of a new term, and Zack is planning to take his relationship with Kelly to the next level. Meanshile, Slater gets reacquainted with old schoolmate Jennifer, who wants Zack to join them as well. Meanwhile, a Mystery man is running around school with no pants on, and Lisa is determined to find out who he is.