Guest Stars:

Kate Woodville          Natira, high priestess of the people of Yonada
Byron Morrow            Admiral Westervelt, who?
Admiral Komak
John Lormer             Old Man
Oracle
 

Crew Appearances:
Kirk, Spock, McCoy
Chekov
Sulu
Scott
Uhura
Nurse Chapel

The Enterprise discovers planet Yonada is on a collision course with another planet and Kirk, Spock and McCoy beam down to warn the Yonadans. But unknown to these people, their "planet" is actually a spaceship sent by their ancestors to colonize a new planet. The ship is controlled by the Oracle, an unrelenting computer, and all will die when the planet hits  if Kirk and the others are unable to free the planet-ship from the Oracle's control.

Fabrina-Fabrini-lived underground when their sun went nova, some were placed on the planetoid space ship Yonada and sent out to their 'new world'.

Xenopolycythemia-fatal illness effecting Dr. McCoy

Yonada- an Asteroid but is 200 mi diameter not orbiting any thing, persuing an independant course, atomic powered, 10,000 years old.

Darin 5 inhabited planet with 3.724 billion, on a collison course with Yonada

Instrument of Obiedience- a disk like thingy placed under the skin at the temple to communicate with the oracle.

The Book of the People- Book of the Promise- tells all about Yonada going to their new world written by the 'Creators'

390 days, Fabrina have to meet with their new world.

Quotes:
Learn what it means to be our enemy before you learn what it means to be our friends." The Oracle.
_______________
"He's dead." McCoy, about the old man who's statement titles this episode.
_______________
"You have released him from his vow of obedience." Natira.
" You've freed him from the cruelty of your oracle." Kirk.