7 disc set containing all the episodes from series two of the original star trek series first broadcast between 1967 and 1968.episodes comprise1'. '.strtoupper('a')mok time2'. '.strtoupper('w')ho mourns for adonais?3'. '.strtoupper('t')he changeling4'. '.strtoupper('m')irror, mirror5'. '.strtoupper('t')he apple6'. '.strtoupper('t')he doomsday machine7'. '.strtoupper('c')atspaw8'. '.strtoupper('i'), mudd9'. '.strtoupper('m')etamorphosis10'. '.strtoupper('j')ourney to babel11'. '.strtoupper('f')riday's child12'. '.strtoupper('t')he deadly years13'. '.strtoupper('o')bsession14'. '.strtoupper('w')olf in the fold15'. '.strtoupper('t')he trouble with tribbles16'. '.strtoupper('t')he gamesters of triskelion17'. '.strtoupper('a') piece of the action18'. '.strtoupper('t')he immunity syndrome19'. '.strtoupper('a') private little war20'. '.strtoupper('r')eturn to tomorrow21'. '.strtoupper('p')atterns of force22'. '.strtoupper('b')y any other name23'. '.strtoupper('t')he omega glory24'. '.strtoupper('t')he ultimate computer25'. '.strtoupper('b')read and circuses26'. '.strtoupper('a')ssignment earth