For the TOS fans (like myself, still my favorite of all the series), have you seen the remastered episodes? I bought these when they were first released on BD, watched them continuously
I think most of the streaming options for TOS now offer the remastered versions.
For those not in the know: the episodes have been digitally cleaned (if you watched reruns on broadcast in the 80/90s know how bad the PQ was ...), the audio also remastered, rerecorded in some cases, and the most interesting thing, the FX shots have been redone. The latter is done really well, it's "feels" very seamless (especially with the new HD, brighter PQ of the non-FX shots) - some of the new visualizations are outstanding, lots of attention to details, but they were careful to keep the general design concept of the original shots. On the BD they had seamless branching, so you could toggle on-the-fly between and old new, was neat to compare the two.