Dr. Nicholas "Nick" Riviera is a quack physician who studied at dubious medical schools.
Appearances
The Simpsons
Main cast, played by Hank Azaria
- Episode 2x17: Old Money (Mar 28, 1991)
- Episode 3x09: Saturdays of Thunder (Nov 14, 1991)
- Episode 4x11: Homer's Triple Bypass (Dec 17, 1992)
- Episode 4x18: So It's Come to This: A Simpsons Clip Show (Apr 1, 1993)
- Episode 4x21: Marge in Chains (May 6, 1993)
- Episode 5x11: Homer the Vigilante (Jan 6, 1994)
- Episode 6x22: Round Springfield (Apr 30, 1995)
- Episode 7x01: Who Shot Mr. Burns? (2) (Sep 17, 1995)
- Episode 7x07: King-Size Homer (Nov 5, 1995)
- Episode 7x21: 22 Short Films About Springfield (Apr 14, 1996)
- Episode 8x02: You Only Move Twice (Nov 3, 1996)
- Episode 8x10: The Springfield Files (Jan 12, 1997)
- Episode 8x17: My Sister, My Sitter (Mar 2, 1997)
- Episode 9x17: Lisa the Simpson (Mar 8, 1998)
- Episode 11x01: Beyond Blunderdome (Sep 26, 1999)
- Episode 11x02: Brother's Little Helper (Oct 3, 1999)
- Episode 12x03: Insane Clown Poppy (Nov 12, 2000)
- Episode 12x18: Trilogy of Error (Apr 29, 2001)
- Episode 12x19: I'm Goin' to Praise Land (May 6, 2001)
- Episode 13x08: Sweets and Sour Marge (Jan 20, 2002)
- Episode 13x16: Weekend at Burnsies (Apr 7, 2002)
- Episode 13x21: Frying Game (May 19, 2002)
- Episode 14x10: Pray Anything (Feb 9, 2003)
- Episode 17x02: The Girl Who Slept Too Little (Sep 18, 2005)
- Episode 17x09: Simpsons Christmas Stories (Dec 18, 2005)
- Episode 20x16: Eeny Teeny Maya Moe (Apr 5, 2009)
- Episode 21x07: Rednecks and Broomsticks (Nov 29, 2009)
- Episode 21x23: Judge Me Tender (May 23, 2010)
- Episode 25x02: Treehouse of Horror XXIV (Oct 6, 2013)
- Episode 27x03: Puffless (Oct 11, 2015)
- Episode 28x11: Pork & Burns (Jan 8, 2017)
- Episode 28x20: Looking for Mr. Goodbart (Apr 30, 2017)
- Episode 29x20: Throw Grampa from the Dane (May 13, 2018)
- Episode 30x14: The Clown Stays in the Picture (Feb 17, 2019)
- Episode 30x23: Crystal Blue-Haired Persuasion (May 12, 2019)
- Episode 31x08: Thanksgiving of Horror (Nov 24, 2019)
- Episode 31x20: Warrin' Priests Part Two (May 3, 2020)
Guest cast, played by Hank Azaria
- Episode 2x10: Bart Gets Hit by a Car (Jan 10, 1991)
- Episode 2x13: Homer vs. Lisa and the Eighth Commandment (Feb 7, 1991)