We don't have a biography for Arnold Horshack yet. Hang in there, or go ahead and contribute one.
Appearances
Welcome Back, Kotter
Main cast, played by Ron Palillo
- Episode 1x01: The Great Debate (Sep 9, 1975)
- Episode 1x02: Basket Case (Sep 16, 1975)
- Episode 1x03: Welcome Back (Pilot) (Sep 23, 1975)
- Episode 1x04: Whodunit? (Sep 30, 1975)
- Episode 1x05: The Election (Oct 7, 1975)
- Episode 1x06: No More Mister Nice Guy (Oct 14, 1975)
- Episode 1x07: Classroom Marriage (Oct 21, 1975)
- Episode 1x08: One of Our Sweathogs is Missing (Oct 28, 1975)
- Episode 1x09: Mr. Kotter, Teacher (Nov 4, 1975)
- Episode 1x10: The Reunion (Nov 18, 1975)
- Episode 1x11: Barbarino's Girl (Nov 25, 1975)
- Episode 1x12: California Dreamin' (Dec 2, 1975)
- Episode 1x13: Arrividerci, Arnold (Dec 16, 1975)
- Episode 1x14: The Longest Weekend (Jan 6, 1976)
- Episode 1x15: The Sit-In (Jan 13, 1976)
- Episode 1x16: Follow the Leader (1) (Jan 20, 1976)
- Episode 1x17: Follow the Leader (2) (Jan 22, 1976)
- Episode 1x18: Dr. Epstein, I Presume (Jan 29, 1976)
- Episode 1x19: One Flu Over the Cuckoo's Nest (Feb 5, 1976)
- Episode 1x20: The Telethon (Feb 12, 1976)
- Episode 1x21: Kotter Makes Good (Feb 19, 1976)
- Episode 1x22: Father Vinnie (Feb 26, 1976)
- Episode 2x01: Career Day (Sep 23, 1976)
- Episode 2x02: Inherit the Halibut (Sep 30, 1976)
- Episode 2x03: Sweatside Story (Oct 7, 1976)
- Episode 2x04: The Fight (Oct 21, 1976)
- Episode 2x05: The Museum (Oct 28, 1976)
- Episode 2x06: Gabe Under Pressure (Nov 4, 1976)
- Episode 2x07: Sweathog, Nebraska Style (Nov 11, 1976)
- Episode 2x08: Sadie Hawkins Day (Nov 18, 1976)
- Episode 2x09: Hello, Ms. Chips (Dec 2, 1976)
- Episode 2x10: Horshack vs. Carvelli (Dec 9, 1976)
- Episode 2x11: Sweathog Clinic for the Cure of Smoking (Dec 16, 1976)
- Episode 2x12: Hark, the Sweatkings (Dec 23, 1976)
- Episode 2x13: A Love Story (Dec 30, 1976)
- Episode 2x14: Caruso's Way (Jan 6, 1977)
- Episode 2x15: Sweatgate Scandal (Jan 13, 1977)
- Episode 2x16: Kotter and Son (Jan 20, 1977)
- Episode 2x17: Chicken a la Kotter (Jan 27, 1977)
- Episode 2x18: Has Anyone Seen Arnold? (1) (Feb 3, 1977)
- Episode 2x19: There Goes Number 5 (2) (Feb 3, 1977)
- Episode 2x20: The Littlest Sweathog (Feb 10, 1977)
- Episode 2x21: Radio Free Freddie (Feb 17, 1977)
- Episode 2x22: I'm Having Their Baby (Feb 24, 1977)
- Episode 2x23: I Wonder Who's Kissing Gabe Now? (Mar 3, 1977)
- Episode 3x01: Sweathog Back-to-School Special (Sep 10, 1977)
- Episode 3x02: And Baby Makes Four (1) (Sep 15, 1977)
- Episode 3x03: And Baby Makes Four (2) (Sep 15, 1977)
- Episode 3x04: The Visit (3) (Sep 22, 1977)
- Episode 3x05: Brother, Can You Spare a Million? (Sep 29, 1977)
- Episode 3x06: Just Testing (Oct 6, 1977)
- Episode 3x07: The Deprogramming of Arnold Horshack (Oct 13, 1977)
- Episode 3x08: What a Move (Oct 20, 1977)
- Episode 3x09: A Novel Idea (Oct 27, 1977)
- Episode 3x10: Barbarino in Love (1) (Nov 3, 1977)
- Episode 3x11: Barbarino in Love (2) (Nov 10, 1977)
- Episode 3x12: Kotter for Vice Principal (Nov 17, 1977)
- Episode 3x13: Swine and Punishment (Nov 24, 1977)
- Episode 3x14: Epstein's Madonna (Dec 8, 1977)
- Episode 3x15: Sweathog Christmas Special (Dec 15, 1977)
- Episode 3x16: Sweatwork (Dec 22, 1977)
- Episode 3x17: Meet Your New Teacher: Batteries Not Included (Jan 5, 1978)
- Episode 3x18: Angie (Jan 12, 1978)
- Episode 3x19: Epstein's Term Paper (Jan 19, 1978)
- Episode 3x20: There's No Business (1) (Jan 26, 1978)
- Episode 3x21: There's No Business (2) (Feb 2, 1978)
- Episode 3x22: What Goes Up (Feb 9, 1978)
- Episode 3x23: Good-Bye, Mr. Kripps (Feb 16, 1978)
- Episode 3x24: Horshack and the Madame X (Feb 23, 1978)
- Episode 3x25: The Kiss (Mar 9, 1978)
- Episode 3x26: The Return of Hotsy Totsy (May 11, 1978)
- Episode 3x27: Class Encounter of the Carvelli Kind (May 18, 1978)
- Episode 4x01: The Drop-Ins (1) (Sep 11, 1978)
- Episode 4x02: The Drop-Ins (2) (Sep 11, 1978)
- Episode 4x03: Beau's Jest (Sep 18, 1978)
- Episode 4x04: Don't Come Up and See Me Sometime (Sep 25, 1978)
- Episode 4x05: Once Upon a Ledge (Oct 2, 1978)
- Episode 4x06: The Sweatmobile (Oct 9, 1978)
- Episode 4x07: Barbarino's Boo Boo (Oct 21, 1978)
- Episode 4x08: X-Rated Education (Oct 28, 1978)
- Episode 4x09: The Barbarino Blues (Nov 4, 1978)
- Episode 4x10: Washington's Clone (Nov 11, 1978)
- Episode 4x11: Frog Day Afternoon (Nov 25, 1978)
- Episode 4x13: A Winter's Coat Tale (Dec 16, 1978)
- Episode 4x14: Bride and Gloom (Jan 13, 1979)
- Episode 4x15: Barbarino's Baby (Feb 3, 1979)
- Episode 4x16: The Goodbye Guy (Feb 10, 1979)
- Episode 4x17: Come Back, Little Arnold (Feb 24, 1979)
- Episode 4x18: Sweat Smell of Success (Mar 3, 1979)
- Episode 4x19: The Gang Show (Mar 17, 1979)
- Episode 4x20: Oo-Oo, I Do (1) (May 25, 1979)
- Episode 4x21: Oo-Oo, I Do (2) (May 25, 1979)
- Episode 4x22: I'm Okay, But You're Not (Jun 1, 1979)
- Episode 4x23: The Bread Winners (Jun 8, 1979)