William Shatner and Sally Kellerman in the Star Trek

William Shatner and Sally Kellerman in the Star Trek episode, Where No Man has Gone Before.

When the Enterprise attempts to penetrate a space barrier, it is damaged and creates a potentially worse problem. Two crew members, including Kirk’s best friend, gain psionic powers that are growing exponentially. This leaves Captain Kirk with the difficult choice; either marooning them or killing before they get so powerful they lose their humanity and become truly dangerous.