Writer(s): John D. F. Black and J. Michael Bingham Director(s): Paul Lynch
Benjamin W.S. Lum as Jim Shimoda
Michael Rider as Transporter Chief
Brooke Bundy as Sarah MacDougal
Synopsis: A sequel episode to “The Naked Time” episode of the old series. The Enterprise rendezvouses with the science vessel U.S.S. Tsiolkovsky and find the entire crew dead. Unknowingly, they bring back to the Enterprise the strange infection that caused the crew of the science vessel to go crazy. The crew of the Enterprise discover that the cure found by the first Enterprise for this disease does not work due to a mutation in the virus.