
This Episode is Dedicated to Gene Roddenberry
The Enterprise is called to investigate the apparent defection of one of a Federation ambassador to Romulous, this ambassador turns out to be Spock. The defection, naturally, poses a great risk to the Federation while also being out of character for Spock though all indications show he left willingly, even planned it.
Picard is able to get a few lucid moments out of Spock's father, Sarek (suffering from the advanced stages of Vulcan Alzheimer's), and learns that Spock may have gone to Romulous to meet with a senator he had met at the Khitomer Conferences (see: Star Trek 6.)
Enlisting the help of the Klingons and their cloaking ships Picard and Data make their way to Romulous in hopes to find this senator, Padek, and get to Spock. Enroute Picard learns of the death of Sarek. While on Romulous waiting for Padek's office to open a disguised Picard and Data are captured by Romulan officers. Luckily it turns out they're working for Padek who is apparently something of a defector in the Romulan senate and is working with Spock.
Meanwhile, Riker and the Enterprise are investigating the discovery of the remains of a Vulcan deflector from a wrecked ship. The deflector belongs to a decommissioned Vulcan ship that is supposed to be in a Federation salvage yard but is no longer there. It seems that as the salvage yard was beaming parts around a "pirate" ship stood in for the supposed destination and stole the salvage. The Enterprise attempts to confront the pirate ship but accidentally destroys it instead.
There's not a lot to say about this episode as it largely plays set-up for the events in the next episode and the key selling point of the episode (Leonard Nimoy returning to Trek on TV as Spock) doesn't really pay off until Part-2. These two episodes do play as a nice semi-sequel to "The Undiscovered Country" which was due in theaters at the time of this episode's original airing.
Naturally, this is one of Mark Lenard's final appearances as Sarek after playing him in TOS and in the TOS Movies, TUC being his last appearance chronologically for us but this episode is his last chronologically in Trek Canon.
There's some cute/funny moments with Picard on the Klingon ship, particularly with him and Data sharing a berth and the interaction with Riker/Troi and the head of the salvage yard are good moments.
But for this episode, really the good (and bad) stuff doesn't really come around until Part 2.
You know, it's odd that when they Pause the security/spy video on the computers it blurs slightly as if it were an analog signal, you'd think it'd be beyond the digital and they have to "enhance" a blurry spy-video frame to make it clearer in order to make out faces. You'd think the computer would have de-blurred the video already. Eh, I guess we just don't understand 24th century computers.
The pirate ship's crew or computers must not have been to observant to not notice a pristine Galaxy-class starship sitting in the junk-yard. While "off" it'd still look to be in good condition, not to mention would still emit life-signs and some sort of low-power levels.
Again, I've not a lot to say about this episode as it mostly seems to play set-up for Part 2.