Not an episode but...
Star Trek V The Final Frontier Blu ray with the audio commentary on.
Best I think I've ever seen it. Film grading and contrast level. Nothing can really make the model shots ILM quality but it looks as good as it ever will.
Learned a lot of stuff from the Okudas, Reeves-Stevenses & Dochterman.
The chemistry between these actors takes some beating, even if Shatner made the supporting players look like idiots once or twice. No questioning his ability to pull off a cinematic vision though. Sweeping panoramas. Some good action scenes. One of Jerry Goldsmith's best. Just needed FX with a higher level of detail and the originally planned ending with the hoardes of molten rockmen.