| Christine Anderson | ||
| Marjorie Barnes | Monica | |
| Brad Blaisdell | Alvin | |
| Wally | ||
| James Brennan | Alvin | |
| Mark Franklin | Norman | |
| Lawrence-Hilton Jacobs | Alvin | |
| Maureen Moore | Cleo | |
| Lawrence John Moss | Alvin | |
| Larry Riley | Wally | |
| Jana Robbins | Cleo | |
| Monica | ||
| Virginia Sandifur | Monica | |
| Janie Sell | Monica | |
| James Seymour | Wally | |
| Barbara Sharma | Cleo | |
| Dick Smothers Broadway debut | Alvin | |
| Tom Smothers Broadway debut | Wally | |
| Hattie Winston | Cleo | |
| Tom Wopat | Wally |