ENT: “Carpenter Street” is my save this time. I don't think I was that enamoured with it when I first watched it, but I rewatched it last year and really got into the Earth's past-based story shenanigans, and T'Pol getting to grips with time-travel. Plus, Leland Orser is always worth a watch.
TOS, Season 1: "What Are Little Girls Made Of?"
TOS, Season 3: “Turnabout Intruder”
TAS, Season 1: “The Lorelei Signal”
TNG, Season 2: "Manhunt"
TNG, Season 6: "Man Of The People"
TNG, Season 6: “Aquiel”
DS9, Season 2: “Second Sight”
DS9, Season 4: "The Muse"
DS9, Season 5: “A Simple Investigation”
DS9, Season 7: “Prodigal Daughter”
VOY, Season 3: “Darkling”
ENT, Season 3: “Rajiin”
ENT, Season 4: "Bound"
DIS, Season 2: "Through The Valley Of Shadows"
DIS, Season 3: "That Hope Is You, Part 1"
PIC, Season 1: “Stardust City Rag”
PIC, Season 1: "Broken Pieces"
PIC, Season 2: "Penance" [spoiler tag discussion of "Penance"]
TOS, Season 1: "What Are Little Girls Made Of?"
TOS, Season 3: “Turnabout Intruder”
TAS, Season 1: “The Lorelei Signal”
TNG, Season 2: "Manhunt"
TNG, Season 6: "Man Of The People"
TNG, Season 6: “Aquiel”
DS9, Season 2: “Second Sight”
DS9, Season 4: "The Muse"
DS9, Season 5: “A Simple Investigation”
DS9, Season 7: “Prodigal Daughter”
VOY, Season 3: “Darkling”
ENT, Season 3: “Rajiin”
ENT, Season 4: "Bound"
DIS, Season 2: "Through The Valley Of Shadows"
DIS, Season 3: "That Hope Is You, Part 1"
PIC, Season 1: “Stardust City Rag”
PIC, Season 1: "Broken Pieces"
PIC, Season 2: "Penance" [spoiler tag discussion of "Penance"]