4. Enterprise Season 5
When Enterprise got cancelled during the production of season 4, the season where it was actually being a TOS prequel, there were already ideas being formed for a fifth season. While Manny Cotto and company were planning to show off the origins of the Federation and build up to the Earth/Romulan War in two mini-arcs, they also had plenty of ideas for the rest of the season. Story ideas included refitting the Enterprise with a secondary hull, bringing Shran on to the crew as an adviser, incorporating Lions of the Night as a Kzinti episode, returning to the mirror universe, and
much more. While not all the stories sound like winners (the Stratos, Borg Queen origins, and Flint stories sound a bit iffy), they were at least interesting ideas in a time when Trek was perceived to be in a creative rut. Despite getting a bit of a revaluation by Trek fans, Enterprise is still seen as one of the weaker series by many. Could Season 5 have made up for the weak first seasons and won over all those who banished it from their head canons? Well never know.