 | Max Wright | ... | Willie Tanner (101 episodes, 1986-1990) |
 | Anne Schedeen | ... | Kate Tanner (101 episodes, 1986-1990) |
 | Andrea Elson | ... | Lynn Tanner (101 episodes, 1986-1990) |
 | Benji Gregory | ... | Brian Tanner (101 episodes, 1986-1990) |
 | Paul Fusco | ... | ALF / ... (59 episodes, 1986-1990) |
 | John LaMotta | ... | Trevor Ochmonek / ... (30 episodes, 1986-1989) |
 | Liz Sheridan | ... | Raquel Ochmonek / ... (29 episodes, 1986-1990) |
 | Josh Blake | ... | Jake Ochmonek (15 episodes, 1988-1989) |
 | Charles Nickerson | ... | Eric Tanner (10 episodes, 1989-1990) |
 | Mihaly 'Michu' Meszaros | ... | ALF / ... (9 episodes, 1986-1990) |
 | Anne Meara | ... | Dorothy Halligan (7 episodes, 1987-1989) |

| Jim J. Bullock | ... | Neal Tanner (5 episodes, 1989-1990) |
 | Bill Daily | ... | Larry (4 episodes, 1987-1989) |
 | Andrea Covell | ... | Judy (3 episodes, 1986-1988) |
 | Paul Dooley | ... | Whizzer (3 episodes, 1987-1989) |
 | Raye Birk | ... | Officer Griswald / ... (3 episodes, 1987-1988) |
 | Beverly Archer | ... | Myrna Byrd (3 episodes, 1988) |

| Dean Cameron | ... | Robert Sherwood (3 episodes, 1989-1990) |
 | Randy Simper | ... | Herb (2 episodes, 1986-1988) |
 | James Brown III | ... | Little Boy (2 episodes, 1987) |

| Carl Franklin | ... | Dr. Willoughby (2 episodes, 1987) |

| Molly Hagan | ... | Denise (2 episodes, 1987) |
 | Keri Houlihan | ... | Tiffany (2 episodes, 1987) |

| Judy Landers | ... | Brenda (2 episodes, 1987) |
 | David Leisure | ... | Brandon Tartikoff / ... (2 episodes, 1987) |
 | Cleavon Little | ... | George Foley (2 episodes, 1987) |
 | Connie Richmond | ... | Nurse #1 (2 episodes, 1987) |

| Patricia Ayame Thomson | ... | Nurse #2 (2 episodes, 1987) |

| Marcia Wallace | ... | Mrs. Lyman (2 episodes, 1987) |
 | Glenn Withrow | ... | Richard (2 episodes, 1987) |
 | Mark Clayman | ... | Randy Boylan (2 episodes, 1988-1989) |
 | Ricky Paull Goldin | ... | Danny Duckworth (2 episodes, 1988-1989) |
 | Stephanie Hagen | ... | Sylvia (2 episodes, 1988-1989) |
 | Wendy Oates | ... | Stephanie (2 episodes, 1988-1989) |
 | Joyce Brothers | ... | Herself (2 episodes, 1988) |

| Michael Champion | ... | Sergeant Fox (2 episodes, 1988) |
 | Frederick De Cordova | ... | Himself (2 episodes, 1988) |

| Teresa Ganzel | ... | Matinee Lady (2 episodes, 1988) |
 | Eugene Greytak | ... | Pope John Paul II (2 episodes, 1988) |
 | Adrienne Hampton | ... | Diana (2 episodes, 1988) |
 | Norman Lee Harris | ... | Jeff (2 episodes, 1988) |
 | Hal Havins | ... | Officer Gaffney (2 episodes, 1988) |

| David Knell | ... | Dudley Ochmonek (2 episodes, 1988) |

| Carlos Lacamara | ... | Doug Gould (2 episodes, 1988) |
 | Robert P. Lieb | ... | Uncle Rocky (2 episodes, 1988) |

| Rich Little | ... | Himself (2 episodes, 1988) |

| Ed McMahon | ... | Himself (2 episodes, 1988) |
 | Shaggy Murphy | ... | Jason (2 episodes, 1988) |
 | Tommy Newsom | ... | Himself (2 episodes, 1988) |

| David Ogden Stiers | ... | Flakey Pete (2 episodes, 1988) |
 | Tim Wade | ... | Stage Manager (2 episodes, 1988) |
|
| Lisa Buckley | .... | special assistant to Alf / personal assistant: "ALF" / ... (38 episodes, 1986-1990) |
| Bob Fappiano | .... | special assistant to Alf / personal assistant: "ALF" / ... (38 episodes, 1986-1990) |
| Linda Fusco | .... | technical supervisor (37 episodes, 1986-1990) |
| Scott Hopper | .... | production assistant / stage manager / ... (36 episodes, 1986-1990) |
| Terrie Barna | .... | assistant to producers (36 episodes, 1986-1989) |
| Sheila Lauder | .... | production associate (35 episodes, 1986-1990) |
| Susan Polmanski | .... | assistant to producers / production coordinator / ... (35 episodes, 1986-1990) |
| Steve Cioffi | .... | production assistant (27 episodes, 1986-1987) |
| Katy Penland | .... | assistant to producers (26 episodes, 1986-1987) |
| Vince Poxon | .... | stage manager (26 episodes, 1986-1987) |
| David Steven Cohen | .... | executive story consultant (26 episodes, 1988-1989) |
| Randy Sutter | .... | production assistant / production coordinator (25 episodes, 1986-1989) |
| Howard Bendetson | .... | executive story editor / creative consultant (25 episodes, 1986-1987) |
| Elizabeth Gower | .... | personal assistant: "ALF" (25 episodes, 1986-1987) |
| Bob Bendetson | .... | executive story editor (24 episodes, 1986-1987) |
| Donald Todd | .... | story editor (24 episodes, 1986-1987) |
| William C. Irwin | .... | technical director (23 episodes, 1986-1990) |
| Rick Gough | .... | associate director (23 episodes, 1986-1987) |
| A.J. Johnson | .... | stage manager (22 episodes, 1986-1989) |
| Lloyd Garver | .... | creative consultant (21 episodes, 1986-1987) |
| Tom Kyle | .... | technical director (15 episodes, 1986-1987) |
| Nancy Kirschner | .... | production coordinator (14 episodes, 1986-1987) |
| Matt Avallone | .... | production coordinator (13 episodes, 1987-1989) |
| Steve Pepoon | .... | executive story editor / story editor / ... (13 episodes, 1988-1990) |
| Leslie Ann Podkin | .... | assistant to producers / assistant to producer / ... (13 episodes, 1988-1990) |
| Tony Csiki | .... | associate director (12 episodes, 1988-1990) |
| Steve Gabriel | .... | production assistant (12 episodes, 1988-1990) |
| Theresa Mingin | .... | production assistant / production coordinator (12 episodes, 1988-1990) |
| Leslie Rieder | .... | production assistant (12 episodes, 1988-1990) |
| Brad Uecker | .... | production assistant / production accountant (12 episodes, 1988-1990) |
| Paul Ohrt | .... | production assistant (11 episodes, 1988-1989) |
| Scott R. Reynders | .... | production assistant (11 episodes, 1988-1989) |
| Roger S.H. Schulman | .... | executive story consultant (11 episodes, 1988-1989) |
| Sheryl E. Hurwitz | .... | production assistant / production coordinator (10 episodes, 1988-1990) |
| Sandy Wernick | .... | executive consultant (9 episodes, 1986-1990) |
| Mihaly 'Michu' Meszaros | .... | personal assistant: "ALF" (9 episodes, 1986-1987) |
| Ron Burla | .... | story editor (5 episodes, 1988-1989) |
| Erma Elzy-Jones | .... | script supervisor / production associate (3 episodes, 1986-1987) |
| Laura Lonsdale | .... | assistant to producers (3 episodes, 1986) |
| Wendy Neckels | .... | production associate / associate director (3 episodes, 1988-1989) |
| Carl Lauten | .... | associate director (2 episodes, 1986-1987) |
| Thad Mumford | .... | creative consultant (2 episodes, 1986-1987) |
| John Lovelady | .... | personal assistant / technical supervisor (2 episodes, 1986) |
| Randy Sutton | .... | production assistant (2 episodes, 1987) |
| A.J. Johnson | .... | stage manager (2 episodes, 1988-1990) |
| David Cohen | .... | executive story consultant (2 episodes, 1988-1989) |
|
| Sheila Lander | .... | production associate (unknown episodes) |
| David Michaels | .... | story editor (unknown episodes) |
| |