TOS: Number One not being a part of the main cast. It would change the dynamics of the show, and there might not be a Nurse Chapel.
TNG: “Parallels” not being a Tasha Yar episode. It’s a good episode on its own, and Worf is a favourite character of mine, but seeing the alternate universes where Yar did not die and is still alive seven years later would be very interesting.
DS9: Sisko vs Dukat in the finale not being like the showdown after the Reckoning tablet was destroyed.
VOY: a) Janeway not interacting with Admiral Nechayev. TNG, DS9 and VOY shared several things - Klingons, Borg, Maquis, Q, even a member of the crew being a Klingon. But Janeway never had a face to face with Nechayev like Picard and Sisko did. Even if it had been a flashback scene, it would have been interesting to see.
b) No DS9/VOY crossover episode.
ENT: “Home” not being a two parter. They could have gone much further with the premise to flesh out the characters, buildup the world a little better, foreshadow future events, reset the show closer to its premise, and give better closure to the Xindi arc all at once:
- See Archer adapting to his new found fame in public, away from rock climbing. Being unable to visit his favourite restaurant or tour a space museum without being swarmed by new fans and media alike.
- See the debate over the E2 upgrades and how Starfleet needs time to evaluate them, as well as how belief in time travel is not widely believed at this point in time and in line with the viewpoint of Vulcans. Have the crew complain that the photonic torpedoes look like coffins – as a reference to Sim - and they want the old spatial torpedoes back. Acknowldge that the E2 phase cannons will be used to upgrade the mining lasers (and be a hint to what becomes the lasers used in The Cage) and the warp engine will be examining to see if they can refit the NX class to warp 7 or if they need to make a new class of ships.
- See a debate of keeping the MACOs around and who will replace Hayes and if Reed even wants to switch departments in light of new found respect for Hayes. Could be how they introduce a gay character or Muslim character into the series to take over from Hayes. And let Reed do Reed things and find that the phase pistols are jamming up more often in the firing range and request upgraded EM pistols with a stun setting, as a throwback to the Broken Bow aesthetic.
- Trip returns home from Vulcan and shows his interest in transferring to Columbia then, rather than waiting halfway through the season to announce it out of the blue.
- After Phlox’s encounter with the xenophobes, the opportunity was ripe to visit Denobula, at least from orbit. Have Sato and Mayweather join him, and let Mayweather mull about returning to the Horizon after being passed over for a promotion over other members of the crew on the journey there. Let there be a debate over it between Sato and Mayweather and tie it into how Earth solved its problems i.e. personal ambition vs all position are treated with equity.
- See the crew psychologically assessed upon their return from the Expanse. See it be recommend that they stay close to Earth and Vulcan for the next year.
- Mention the planned rescue of the Illyrians and the Skagarans in the Expanse, with either the Vulcans or Columbia being the ones to follow up on them.
- Acknowledgement of the development of Xindi memorials. Have the crew attend one.
Short Treks: Not being more of an anthology series.