Queen Aggravain has ruled that none may marry until her son, Prince Dauntless marries. However, she has managed to sabotage every princess that come along. When Sir Harry and Lady Larken learn that they are going to be parents, wed or not, he goes off to the swamps and brings back Princess Winnifred ("Fred" to her friends).
Unfortunately the movie Once Upon A Mattress is not yet available on HBO Max.
| Writing | Mary Rodgers | Musical |
| Writing | Dean Fuller | Musical |
| Camera | Robert McLachlan | Director of Photography |
| Writing | Janet Brownell | Writer |
| Production | Coreen Mayrs | Casting |
| Editing | Scott Vickrey | Editor |
| Production | Stephanie Gorin | Casting |
| Writing | Jay Thompson | Musical |
| Writing | Marshall Barer | Musical |
| Costume & Make-Up | Christopher Hargadon | Costume Design |
| Production | Marc Platt | Executive Producer |
| Directing | Kathleen Marshall | Director |
| Sound | Mary Rodgers | Songs |
| Sound | Mary Rodgers | Music |
| Writing | Marshall Barer | Lyricist |
| Production | Carol Burnett | Executive Producer |
| Production | Marty Tudor | Executive Producer |
| Costume & Make-Up | Stacey Butterworth | Wigmaker |
| Costume & Make-Up | Diane Holme | Hairstylist |
| Costume & Make-Up | Jill Winston | Hairstylist |
| Art | Ross Dempster | Art Direction |
| Art | Shirley Inget | Set Decoration |
