Welcome Back, Kotter is an American television sitcom starring Gabe Kaplan and featuring a young John Travolta. Videotaped in front of a live studio audience, it originally aired on the ABC network from September 9, 1975, to June 8, 1979.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Welcome Back (Pilot) | 1975-09-23 | 30 min |
| Season 1 | Episode 2 | The Great Debate | 1975-09-09 | 30 min |
| Season 1 | Episode 3 | Basket Case | 1975-09-16 | 30 min |
| Season 1 | Episode 4 | Whodunit? | 1975-09-30 | 30 min |
| Season 1 | Episode 5 | The Election | 1975-10-07 | 30 min |
| Season 1 | Episode 6 | No More Mister Nice Guy | 1975-10-14 | 30 min |
| Season 1 | Episode 7 | Classroom Marriage | 1975-10-21 | 30 min |
| Season 1 | Episode 8 | One of Our Sweathogs is Missing | 1975-10-28 | 30 min |
| Season 1 | Episode 9 | Mr. Kotter, Teacher | 1975-11-04 | 30 min |
| Season 1 | Episode 10 | The Reunion | 1975-11-18 | 30 min |
| Season 1 | Episode 11 | Barbarino's Girl | 1975-11-25 | 30 min |
| Season 1 | Episode 12 | California Dreamin' | 1975-12-02 | 30 min |
| Season 1 | Episode 13 | Arrividerci, Arnold | 1975-12-16 | 30 min |
| Season 1 | Episode 14 | The Longest Weekend | 1976-01-06 | 30 min |
| Season 1 | Episode 15 | The Sit-In | 1976-01-13 | 30 min |
| Season 1 | Episode 16 | Follow the Leader (1) | 1976-01-20 | 30 min |
| Season 1 | Episode 17 | Follow the Leader (2) | 1976-01-22 | 30 min |
| Season 1 | Episode 18 | Dr. Epstein, I Presume | 1976-01-29 | 30 min |
| Season 1 | Episode 19 | One Flu Over the Cuckoo's Nest | 1976-02-05 | 30 min |
| Season 1 | Episode 20 | The Telethon | 1976-02-12 | 30 min |
| Season 1 | Episode 21 | Kotter Makes Good | 1976-02-19 | 30 min |
| Season 1 | Episode 22 | Father Vinnie | 1976-02-26 | 30 min |
| Season 2 | Episode 1 | Career Day | 1976-09-23 | 30 min |
| Season 2 | Episode 2 | Inherit the Halibut | 1976-09-30 | 30 min |
| Season 2 | Episode 3 | Sweatside Story | 1976-10-07 | 30 min |
| Season 2 | Episode 4 | The Fight | 1976-10-21 | 30 min |
| Season 2 | Episode 5 | The Museum | 1976-10-28 | 30 min |
| Season 2 | Episode 6 | Gabe Under Pressure | 1976-11-04 | 30 min |
| Season 2 | Episode 7 | Sweathog, Nebraska Style | 1976-11-11 | 30 min |
| Season 2 | Episode 8 | Sadie Hawkins Day | 1976-11-18 | 30 min |
| Season 2 | Episode 9 | Hello, Ms. Chips | 1976-12-02 | 30 min |
| Season 2 | Episode 10 | Horshack vs. Carvelli | 1976-12-09 | 30 min |
| Season 2 | Episode 11 | Sweathog Clinic for the Cure of Smoking | 1976-12-16 | 30 min |
| Season 2 | Episode 12 | Hark, the Sweatkings | 1976-12-23 | 30 min |
| Season 2 | Episode 13 | A Love Story | 1976-12-30 | 30 min |
| Season 2 | Episode 14 | Caruso's Way | 1977-01-06 | 30 min |
| Season 2 | Episode 15 | Sweatgate Scandal | 1977-01-13 | 30 min |
| Season 2 | Episode 16 | Kotter and Son | 1977-01-20 | 30 min |
| Season 2 | Episode 17 | Chicken a la Kotter | 1977-01-27 | 30 min |
| Season 2 | Episode 18 | Has Anyone Seen Arnold? (1) | 1977-02-03 | 30 min |
| Season 2 | Episode 19 | There Goes Number 5 (2) | 1977-02-03 | 30 min |
| Season 2 | Episode 20 | The Littlest Sweathog | 1977-02-10 | 30 min |
| Season 2 | Episode 21 | Radio Free Freddie | 1977-02-17 | 30 min |
| Season 2 | Episode 22 | I'm Having Their Baby | 1977-02-24 | 30 min |
| Season 2 | Episode 23 | I Wonder Who's Kissing Gabe Now? | 1977-03-03 | 30 min |
| Season 3 | Episode 1 | Sweathog Back-to-School Special | 1977-09-10 | 30 min |
| Season 3 | Episode 2 | And Baby Makes Four (1) | 1977-09-15 | 30 min |
| Season 3 | Episode 3 | And Baby Makes Four (2) | 1977-09-15 | 30 min |
| Season 3 | Episode 4 | The Visit | 1977-09-22 | 30 min |
| Season 3 | Episode 5 | Brother, Can You Spare a Million? | 1977-09-29 | 30 min |
| Season 3 | Episode 6 | Just Testing | 1977-10-06 | 30 min |
| Season 3 | Episode 7 | The Deprogramming of Arnold Horshack | 1977-10-13 | 30 min |
| Season 3 | Episode 8 | What a Move | 1977-10-20 | 30 min |
| Season 3 | Episode 9 | A Novel Idea | 1977-10-27 | 30 min |
| Season 3 | Episode 10 | Barbarino in Love (1) | 1977-11-03 | 30 min |
| Season 3 | Episode 11 | Barbarino in Love (2) | 1977-11-10 | 30 min |
| Season 3 | Episode 12 | Kotter for Vice Principal | 1977-11-17 | 30 min |
| Season 3 | Episode 13 | Swine and Punishment | 1977-11-24 | 30 min |
| Season 3 | Episode 14 | Epstein's Madonna | 1977-12-08 | 30 min |
| Season 3 | Episode 15 | Sweathog Christmas Special | 1977-12-15 | 30 min |
| Season 3 | Episode 16 | Sweatwork | 1977-12-22 | 30 min |
| Season 3 | Episode 17 | Meet Your New Teacher: Batteries Not Included | 1978-01-05 | 30 min |
| Season 3 | Episode 18 | Angie | 1978-01-12 | 30 min |
| Season 3 | Episode 19 | Epstein's Term Paper | 1978-01-19 | 30 min |
| Season 3 | Episode 20 | There's No Business (1) | 1978-01-26 | 30 min |
| Season 3 | Episode 21 | There's No Business (2) | 1978-02-02 | 30 min |
| Season 3 | Episode 22 | What Goes Up | 1978-02-09 | 30 min |
| Season 3 | Episode 23 | Good-Bye, Mr. Kripps | 1978-02-16 | 30 min |
| Season 3 | Episode 24 | Horshack and the Madame X | 1978-02-23 | 30 min |
| Season 3 | Episode 25 | The Kiss | 1978-03-09 | 30 min |
| Season 3 | Episode 26 | The Return of Hotsy Totsy | 1978-05-11 | 30 min |
| Season 3 | Episode 27 | Class Encounter of the Carvelli Kind | 1978-05-18 | 30 min |
| Season 4 | Episode 1 | The Drop-Ins (1) | 1978-09-11 | 30 min |
| Season 4 | Episode 2 | The Drop-Ins (2) | 1978-09-11 | 30 min |
| Season 4 | Episode 3 | Beau's Jest | 1978-09-18 | 30 min |
| Season 4 | Episode 4 | Don't Come Up and See Me Sometime | 1978-09-25 | 30 min |
| Season 4 | Episode 5 | Once Upon a Ledge | 1978-10-02 | 30 min |
| Season 4 | Episode 6 | The Sweatmobile | 1978-10-09 | 30 min |
| Season 4 | Episode 7 | Barbarino's Boo-Boo | 1978-10-21 | 30 min |
| Season 4 | Episode 8 | X-Rated Education | 1978-10-28 | 30 min |
| Season 4 | Episode 9 | The Barbarino Blues | 1978-11-04 | 30 min |
| Season 4 | Episode 10 | Washington's Clone | 1978-11-11 | 30 min |
| Season 4 | Episode 11 | Frog Day Afternoon | 1978-10-09 | 30 min |
| Season 4 | Episode 12 | A Little Fright Music | 1978-12-02 | 30 min |
| Season 4 | Episode 13 | A Winter's Coat Tail | 1978-12-16 | 30 min |
| Season 4 | Episode 14 | Bride and Gloom | 1979-01-13 | 30 min |
| Season 4 | Episode 15 | Barbarino's Baby | 1979-02-03 | 30 min |
| Season 4 | Episode 16 | The Goodbye Guy | 1979-02-10 | 30 min |
| Season 4 | Episode 17 | Come Back, Little Arnold | 1979-02-24 | 30 min |
| Season 4 | Episode 18 | The Sweat Smell of Success | 1979-03-03 | 30 min |
| Season 4 | Episode 19 | The Gang Show | 1979-03-17 | 30 min |
| Season 4 | Episode 20 | Oo, Oo, I Do (1) | 1979-05-25 | 30 min |
| Season 4 | Episode 21 | Oo, Oo, I Do (2) | 1979-05-25 | 30 min |
| Season 4 | Episode 22 | I'm Okay, But You're Not | 1979-06-01 | 30 min |
| Season 4 | Episode 23 | The Breadwinners | 1979-06-08 | 30 min |
| Production | James Komack | Executive Producer |
| Production | Eric Cohen | Producer |
| Production | George Yanok | Producer |
| Production | Alan Sacks | Producer |
| Sound | John Sebastian | Theme Song Performance |