September 8, 1966 to June 3, 1969
First episode: 1513.1, “The Man Trap”
Final episode: 5928.5, “Turnabout Intruder”

September 8, 1973 to October 12, 1974
First episode: 5521.3, “Beyond the Farthest Star”
Final episode: 6770.3, “The Counter-Clock Incident”

September 28, 1987 to May 23, 1994
First episode: 41153.7, “Encounter At Farpoint”
Final episode: 47988, “All Good Things...”

January 3, 1993 to June 2, 1999
First episode: 46379.1, “Emissary, Part I”
Final episode: no stardate, “What You Leave Behind”

January 3, 1993 to June 2, 1999
First episode: 48315.6, “Caretaker”
Final episode: 54973.4, “Endgame”