| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Amy Davidson | Cast | Actress | Herself | 1 |
 Anna Nicole Smith | Cast | Actress | Self (archive footage) | 1 |
 Annette Charles | Cast | Actress | Cha Cha DiGregorio (archive footage) | 1 |
 Barry Pearl | Cast | Actor | Doody (archive footage) | 1 |
 Didi Conn | Cast | Actress | French (archive footage) | 1 |
 Dinah Manoff | Cast | Actress | Marty Maraschino (archive footage) | 1 |
 Elvis Presley | Cast | Actor | Self (archive footage) | 1 |
 J.K. Rowling | Cast | Actress | Self | 1 |
 Jacqueline Kennedy | Cast | Actress | Self (archive footage) | 1 |
 Jamie Donnelly | Cast | Actress | Jan (archive footage) | 1 |
 Jeff Conaway | Cast | Actor | Kenickie (archive footage) | 1 |
 John Ritter | Cast | Actor | Himself (archive footage) | 1 |
 John Travolta | Cast | Actor | Danny Zuko (archive footage) | 1 |
 Joyce DeWitt | Cast | Actress | Herself | 1 |
 Kaley Cuoco | Cast | Actress | Herself | 1 |
 Kelly Ward | Cast | Actor | Putzie (archive footage) | 1 |
 Martin Spanjers | Cast | Actor | Himself | 1 |
 Michael Tucci | Cast | Actor | Sonny (archive footage) | 1 |
 Olivia Newton-John | Cast | Actress | Sandy Olsson (archive footage) | 1 |
 Phil Hartman | Cast | Actor | Self (archive footage) | 1 |
 Diana, Princess of Wales | Cast | Actress | Self (archive footage) | 1 |
 Richard Kline | Cast | Actor | Himself | 1 |
 Robin Williams | Cast | Actor | Self (archive footage) | 1 |
 Stockard Channing | Cast | Actress | Rizzo (archive footage) | 1 |
 Suzanne Somers | Cast | Actress | Herself | 1 |
 Natalie Morales | Cast | Actress | Self - Host | 27 |
 Dennis Stewart | Cast | Actor | Leo 'Craterface' Balmudo (archive footage) | 1 |
| Person | Type | Job | Role(s) | Episodes |
