Star Trek Phase 2 is probably the best produced, best scripted and most famous fan series out there.
Its designed simply as a continuation of the original (pre-reboot) star trek series, but its actuals much more then that. While it stays true to its source material its, imho, far superior. The plotlines are more cinematic, and characters more fleshed out and the general scope of the show more grand. In fact, its managed to draw enough of a reputation as to get many of the original actors guest-staring, and old scripts from TOS are being used for some of its own episodes.
One particular episode of note is "Blood and Fire", especially the second part. Production quality good, story well told, acting mostly pretty good, and effects are wonderful (yet also fitting the old style). The last effect of blood and fire were particularly pretty.
, Reviewed By Darkflame
Star Trek Phase 2 created by James Cawley and Jack Marshall