Maybe I'm the Chance of Rain

Tumultuous and vindictive the planet, Etoph, fights to subjugate its inhabitants until the enterprise fights back. Oddly enough, the transporter beams everyone back aboard besides Spock. Reluctantly, Spock permits an ailing Nyota to join him planetside. Both healing from thier time on Altamid, the couple learns to fend for one another in a primitive culture.