If we learned anything from Star Trek is if you change one thing you get a whole lot of other unexpected things. If Khan had showed up again in TOS or in TAS then there's no guarantee he would have been seen again in the films.
Although fans, and writers, would like to have seen certain characters again Roddenberry's take during TOS was the Enterprise was outbound on the frontier and thus highly unlikely to run into the same people again. So while "The Trouble With Tribbles" and "Day Of The Dove" were originally written with Kor in mind he did not appear because John Colicos was not available due to scheduling conflicts. If Kor had returned we wouldn't have gotten Koloth (not a big loss), but moreso we wouldn't have gotten Michael Ansara's excellent turn as Kang.
During TOS Harry Mudd was the one-off exception, and I could argue it wasn't that inspired a return story wise. In TAS some of the most meh episodes were those featuring a returning character.
- "Mudd's Passion" was pointless and sloppily written.
- "More Tribbles, More Troubles" was just extending a joke that had already been done.
- One downer about "Time Trap" was that Kor not only didn't look like Kor and didn't sound like Kor, but he didn't act like Kor either. He was written just as another run-of-the-mill baddie.
Seeing Khan again in "The Savage Curtain" would have complicated and likely diluted what we saw earlier in "Space Seed."
Although fans, and writers, would like to have seen certain characters again Roddenberry's take during TOS was the Enterprise was outbound on the frontier and thus highly unlikely to run into the same people again. So while "The Trouble With Tribbles" and "Day Of The Dove" were originally written with Kor in mind he did not appear because John Colicos was not available due to scheduling conflicts. If Kor had returned we wouldn't have gotten Koloth (not a big loss), but moreso we wouldn't have gotten Michael Ansara's excellent turn as Kang.
During TOS Harry Mudd was the one-off exception, and I could argue it wasn't that inspired a return story wise. In TAS some of the most meh episodes were those featuring a returning character.
- "Mudd's Passion" was pointless and sloppily written.
- "More Tribbles, More Troubles" was just extending a joke that had already been done.
- One downer about "Time Trap" was that Kor not only didn't look like Kor and didn't sound like Kor, but he didn't act like Kor either. He was written just as another run-of-the-mill baddie.
Seeing Khan again in "The Savage Curtain" would have complicated and likely diluted what we saw earlier in "Space Seed."
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