Bear with me on the background to my question... I bought my favorite TOS episodes from iTunes (remastered versions). Then I bought a couple more Klingon episodes and one that serves as a "time-travel prequel" to the ultimate TOS-tribute episode of Enterprise, for a total of 12 TOS episodes. I plan to burn these onto 3 DVD discs of 4 episodes each. Here are the 12 episodes: "The Naked Time" "Balance of Terror" "Space Seed" “Errand of Mercy” "The City on the Edge of Forever" “Amok Time” "Mirror, Mirror" "Journey to Babel" "The Trouble with Tribbles" "The Enterprise Incident" “The Tholian Web” “Day of the Dove” I have a baby boy. Thinking ahead, I decided that I will introduce Star Trek to him with the TAS when he is old enough, so I've already bought it on DVD. Then if he likes that, I thought a great transition into TOS would be the TOS episodes that are most relevant to the TAS, like "The Trouble with Tribbles". I already have some of those episodes (above), so I decided to also buy three more TOS episodes that have TAS sequels: "Mudd’s Women" "Shore Leave" "I, Mudd" Since I can burn 4 episodes onto one disc, I will have room for one more episode on a "bonus disc" of TOS episodes for my son. Considering that my son and I will already have all 15 of the above listed episodes, my question for all of you is: What is one more episode I can buy that kids might be interested in? Thanks!