Ep. #   Air Date      Grade    Ep. Name 
Season 1 

  1.    9 Sep 73       A       Yesteryear 
  2.   1- 2        007     22 Sep 73   One of Our Planets is Missing 
  3.   1- 3       006     29 Sep 73   The Lorelei Signal 
  4.   1- 4  001  6 Oct 73  More Tribbles, More Troubles 
  5.   1- 5        005     13 Oct 73   The Survivor 
  6.   1- 6      002     20 Oct 73   The Infinite Vulcan 
  7.   27 Oct 73       B       The Magicks of Megas-Tu 
  8.   3 Nov 73          B     Once Upon a Planet 
  9.   1- 9        008     10 Nov 73   Mudd's Passion 
 10.   1-10    015     17 Nov 73   The Terratin Incident 
 11.    24 Nov 73    B        Time Trap 
 12.     1 Dec 73      C+     The Ambergris Element 
 13.   15 Dec 73       B       Slaver Weapon 
 14.   22 Dec 73      C+    Beyond the Farthest Star 
 15.   6 Jan 74       B+    The Eye of the Beholder 
 16.   1-16        012     13 Jan 74   Jihad 
Season 2 
 17.   2- 1     019      7 Sep 74   The Pirates of Orion 
 18.   2- 2        017     14 Sep 74   Bem 
 19.   2- 3        020     21 Sep 74   Practical Joker 
 20.   2- 4        018     28 Sep 74   Albatross 
 21.   2- 5        021      5 Oct 74   How Much Sharper Than a Serpent's Tooth? 
 22.   2- 6  022  12 Oct 74   The Counter-Clock