| Mark-Paul Gosselaar | ... | Zachary 'Zack' Morris / ... (86 episodes, 1989-1993) |
| Mario López | ... | Albert Clifford 'A.C.' Slater / ... (86 episodes, 1989-1993) |
 | Dustin Diamond | ... | Samuel 'Screech' Powers / ... (86 episodes, 1989-1993) |
| Lark Voorhies | ... | Lisa Turtle (86 episodes, 1989-1993) |
| Elizabeth Berkley | ... | Jessica 'Jessie' Myrtle Spano / ... (76 episodes, 1989-1993) |
| Tiffani Thiessen | ... | Kelly Kapowski (74 episodes, 1989-1993) |
| Dennis Haskins | ... | Mr. Richard Belding / ... (72 episodes, 1989-1993) |
| Ed Alonzo | ... | Max (21 episodes, 1989-1992) |
| Leanna Creel | ... | Tori Scott (10 episodes, 1992-1993) |
| Troy Fromin | ... | Ox / ... (9 episodes, 1991-1992) |
| Angella Kaye | ... | Student (8 episodes, 1990-1991) |
| Ernie Sabella | ... | Leon Carosi (6 episodes, 1991) |
| Leah Remini | ... | Stacey Carosi (6 episodes, 1991) |
| Jack Angeles | ... | Mr. Tuttle (5 episodes, 1989-1992) |
| Bridgette Wilson | ... | Ginger (5 episodes, 1992) |
| Holly Marie Combs | ... | Paige Atwood (5 episodes, 1989) |
| Patrick Thomas O'Brien | ... | Mr. Dewey (4 episodes, 1989-1992) |
| Pamela Kosh | ... | Miss Simpson / ... (4 episodes, 1989-1991) |
| Scott Wolf | ... | Student / ... (4 episodes, 1990-1991) |
| Melody Rogers | ... | Mrs. Melanie Morris (3 episodes, 1991) |
| Patrick Muldoon | ... | Jeffrey Hunter (3 episodes, 1991) |
| Carol Lawrence | ... | Miss Wentworth (3 episodes, 1989-1991) |
| Tori Spelling | ... | Violet Anne Bickerstaff (3 episodes, 1990-1991) |
| Mike Lavelle | ... | Kevin the Robot (3 episodes, 1989-1992) |
| William Joseph Barker | ... | Edgar Poindexter / ... (3 episodes, 1989) |
| Mark Clayman | ... | Moose / ... (3 episodes, 1989-1992) |
| Ryan Holihan | ... | Sylvester (3 episodes, 1992-1993) |
| Lara Lyon | ... | Louise (3 episodes, 1990-1992) |
| Kurt Krakowian | ... | Larry (3 episodes, 1991-1992) |
| Michael Warwick | ... | Franklin Finkley (3 episodes, 1991) |
| George McDaniel | ... | Mr. Spano (2 episodes, 1991) |
| Stephen Mendel | ... | Frank Benton (2 episodes, 1991) |
| John Sanderford | ... | Derek Morris / ... (2 episodes, 1990-1992) |
| Mark Blankfield | ... | James / ... (2 episodes, 1990-1991) |
| Susan Beaubian | ... | Dr. Turtle / ... (2 episodes, 1991-1992) |
| Barbra Brighton | ... | Leslie (2 episodes, 1991) |
| Joshua Hoffman | ... | Eric Tramer (2 episodes, 1991) |
| Gerald Castillo | ... | Major Slater (2 episodes, 1989-1992) |
| Jennifer McComb | ... | Laura Benton (2 episodes, 1991) |
| Vaughn Armstrong | ... | Mr. Breskin (2 episodes, 1992) |
| Casey Kasem | ... | Himself (2 episodes, 1989-1991) |
| Bernie Hiller | ... | Mr. Sachs (2 episodes, 1991) |
| Eva Loseth | ... | Christina (2 episodes, 1991) |
| Richard Israel | ... | Ronald Geekman (2 episodes, 1990-1992) |
| Monty Hoffman | ... | Coach Sonski / ... (2 episodes, 1991) |
| Lew Horn | ... | Mr. Moody (2 episodes, 1991) |
| Kirsten Holmquist | ... | Rhonda Robistelli (2 episodes, 1989) |
| Jeffrey Asch | ... | Maxwell Nerdstrom (2 episodes, 1990-1992) |
| Juliet Mills | ... | Miss Bliss (2 episodes, 1991-1992) |
|
| Vince Poxon | .... | stage manager (16 episodes, 1989) |
| Carter Blanchard | .... | assistant to producer / production assistant / ... (12 episodes, 1989) |
| Melinda Casey | .... | stage manager (3 episodes, 1989) |
| Ellen Deutsch | .... | production associate (3 episodes, 1989) |
| Brett Dewey | .... | assistant to producers (3 episodes, 1989) |
| Mark Fetterman | .... | production coordinator (3 episodes, 1989) |
| Penelope Gottlieb | .... | title designer: main titles (3 episodes, 1989) |
| Maria Henley | .... | stage manager (3 episodes, 1989) |
| Joann Kamay | .... | stage manager / assistant to producers (3 episodes, 1989) |
| Dan Miller | .... | assistant to producers (3 episodes, 1989) |
| Henry Moreno | .... | technical director (3 episodes, 1989) |
| Jeannie Taylor | .... | script coordinator (3 episodes, 1989) |
| Bennett Tramer | .... | executive story editor / story editor (3 episodes, 1989) |
| Ed Clegg | .... | assistant to producers (2 episodes, 1989) |
| Scott Spencer Gordon | .... | executive script consultant (2 episodes, 1989) |
| Ronald B. Solomon | .... | script coordinator (2 episodes, 1989) |
|
| Pier Seymour | .... | assistant to executive producer / assistant to producers (unknown episodes, 1990-1991) |
| Mark Arellano | .... | production assistant (unknown episodes) |
| Cynthia Barrett | .... | assistant to producers (unknown episodes) |
| Cynthia Barrett | .... | assistant to producers (unknown episodes) |
| Lisa DeBenedictis | .... | executive story editor (unknown episodes) |
| Debra Fasciano | .... | story editor (unknown episodes) |
| Cara Giannini | .... | assistant to producer (unknown episodes) |
| Scott Gorden | .... | executive script consultant (unknown episodes) |
| Gib James | .... | assistant to producers (unknown episodes) |
| Ollie Levy | .... | script coordinator (unknown episodes) |
| Susan Metrick | .... | assistant to producer (unknown episodes) |
| Chris Probst | .... | assistant to producers (unknown episodes) |
| Christi Probst | .... | assistant to producers (unknown episodes) |
| Roberta Risafi | .... | script coordinator (unknown episodes) |
| Roberto Risafi | .... | script coordinator (unknown episodes) |
| Daryl Rowland | .... | executive story editor (unknown episodes) |
| Jeffrey J. Sachs | .... | executive story consultant (unknown episodes) |
| Kathleen Sanders | .... | production assistant (unknown episodes) |
| Ed Smith | .... | assistant to producers (unknown episodes) |
| Tony Soltis | .... | script coordinator (unknown episodes) |
| Jeff Yerkes | .... | assistant to producers (unknown episodes) |
| |
