| The concept of the series was the showing of unaired and unsold television pilots that did not make the television lineup for CBS. The show was successful during its first few seasons due to the fact that the show's concept, airing unsold and unaired television pilots, was a popular concept in the 1960s. But during its last two seasons on the air, the series did find some trouble due to the fact that the series were running out of pilots to air and, in their 4th season, they began airing repeats from the three seasons prior. During its 1966 summer run, the series aired eights new pilots and two repeats and during its last year airing five new pilots and four repeats. |
| Name | Character | Episodes |
|---|---|---|
| Charles Bronson | John Wesley Hardin | 2 |
| Edgar Buchanan | Luke | 2 |
| Cliff Norton | Phil | 1 |
| Diane McBain | Sherry | 1 |
| Barry Livingston | Roger | 1 |
| Jackie Coogan | Finnegan | 1 |
| Orson Bean | 1 | |
| Ellen Burstyn | Ellen | 1 |
| Eve Arden | Claudia Cooper | 1 |
| John Fiedler | Argey Tanner | 1 |
| Beau Bridges | Brandon Drood | 1 |
| Stefanie Powers | Linda Craig | 1 |
| Sherry Jackson | Alice Watson | 1 |
| Nick Adams | Richard Martin | 1 |
| Van Johnson | 1 | |
| Bill Mumy | Chris Williams | 1 |
| Brenda Vaccaro | Jenny Penny | 1 |
| Ellen Corby | 1 | |
| Glynis Johns | Glynis Granville | 1 |
| Buddy Ebsen | 1 | |
| Martin Milner | 1 | |
| Andy Devine | Andy | 1 |
| Dean Jones | Alec Tate | 1 |
| Tom Nolan | 1 | |
| John Litel | Albert P. Leviathan | 1 |
| Ross Martin | Clint Hightower | 1 |
| Lee Meriwether | Doris | 1 |
| Pat Crowley | Elizabeth Williams | 1 |
| Pat Crowley | Joan | 1 |
| Wally Cox | Alfred | 1 |
| Joel Grey | Freddy Rockefeller | 1 |
| Michael Burns | Col. Rod Ryan | 1 |
| Richard Benjamin | Ted Penny | 1 |
| Joanna Moore | Marge Cameron | 1 |
| Judi Meredith | 1 | |
| Robert Middleton | Homer Ferguson | 1 |
| Ruth Hussey | Nurse Edie Ramsey | 1 |
| Joanna Barnes | 1 | |
| Don Porter | Battersea, The Housekeeper | 1 |
| Bea Benaderet | Sybil Murdock | 1 |
| Barbara Nichols | Barbara Adams | 1 |
| Kay Medford | Mrs. Piper | 1 |
| Jay C. Flippen | Cappy Skidmore | 1 |
| Barbara Stuart | Nancy Gifford | 1 |
| Luana Anders | Sybil Rockefeller | 1 |
| Larry Storch | Commodore | 1 |
| Dan Dailey | Sergeant Mike Parker | 1 |
| Patsy Kelly | Miss Primrose | 1 |
| Frank Aletter | Lester Belstrip | 1 |
| Gale Gordon | Warren Packard | 1 |
| Julie Gregg | Barbara Piper | 1 |
| Keenan Wynn | 1 | |
| Andrew Prine | Ernie Watson | 1 |
| Andrew Prine | 1 | |
| Yvonne Craig | Abby Young | 1 |
| Tony Randall | Willie Coogan | 1 |
| William Bendix | 1 | |
| Jan Sterling | 1 | |
| Stuart Whitman | 1 | |
| Marcel Dalio | 1 | |
| Donald O'Connor | Donald Dugan | 1 |
| Ann Jillian | Bev Ferguson | 1 |
| Fred Clark | 1 | |
| Cesare Danova | Mario Cellini | 1 |
| Alvy Moore | Otis Platt | 1 |
| Willard Waterman | Coach Walter Biddle | 1 |
| Jerome Cowan | Brainsley Gordon | 1 |
| Larry Keating | Albert Murdock | 1 |
| Mickey Shaughnessy | Coach Mickey Brennan | 1 |
| Keith Andes | Keith Granville | 1 |
| Elvia Allman | Miss Whipple | 1 |
| Sheila Bromley | Martha Sweetley | 1 |
| Joan Blondell | Miss Zilke | 1 |
| Tisha Sterling | Elsie Stanhope | 1 |
| Art Metrano | Big D | 1 |
| Ginger Rogers | Elizabeth Harcourt / Margaret Harcourt | 1 |
| Pat Buttram | Hardy Madison | 1 |
| Reta Shaw | Aunt Josie | 1 |
| Reta Shaw | Mrs. Foley | 1 |
| Audrey Totter | 1 | |
| Dave Willock | Carl Ryan | 1 |
| Joyce Bulifant | Connie Duncan | 1 |
| Ethel Merman | Maggie Brown | 1 |
| George N. Neise | Seymour | 1 |
| Herschel Bernardi | Jerome P. Baggley | 1 |
| Joyce Jameson | Vanda Renee | 1 |
| Charles Ruggles | Eli Harcourt | 1 |
| James Dunn | P.J. Cunningham | 1 |
| Soupy Sales | Fireman Smokey | 1 |
| Soupy Sales | Fred Brady | 1 |
| Roger Perry | Ben Duncan | 1 |
| Mary Jane Croft | Helen | 1 |
| Jaye P. Morgan | Maggie Feeney | 1 |
| Marvin Kaplan | Marvin | 1 |
| Shirley Mitchell | Shirley Biddle | 1 |
| Ruby Keeler | Ruby | 1 |
| Peter Robbins | Richard | 1 |
| Derek Bond | George Andrews | 1 |
| Robyn Millan | Bunny Tate | 1 |
| Bobby Rydell | Skooby-Doo | 1 |
| Barbara Bostock | Dina Martin | 1 |
| Barry McGuire | Buster Krause | 1 |
| Judy Canova | Tillie Meeks | 1 |
| Darryl Hickman | Schuyler 'Sky' Young | 1 |
| Darryl Hickman | Joe Hannon | 1 |
| Darryl Hickman | Rok | 1 |
| Gerald Mohr | 1 | |
| Sara Haden | Emma Madison | 1 |
| Wallace Ford | Lester Tinney | 1 |