 | Albert Finney als George Smith |
 | Yvette Mimieux als Alice Smith |
 | Luis Miguel Dominguín als Luis Miguel Dominguín |
 | Theo Marcuse als The Host (as Theo Marcuse) |
 | Jim Connell als The Artist |
| Sopwith Camel als Sopwith Camel, The Band at the Party |
 | Peter Madden als Blind Artist |
 | Graham Stark als Picasso's Postal Carrier |
 | Tutte Lemkow als Drunk Man (who George brings back from bar) |
 | Bee Duffell als German Tourist Wife |
 | Marty Ingels als Man at Party |
 | Georgina Cookson als British Woman at Dinner |
 | Miki Iveria als Blind Artist's Wife |
 | Kathryn Reynolds |
| Stephen Scott als German Tourist |
| Miki Iveria als Blind Man's Wife |
| Bee Duffell als German Tourist |
| Dorsay Dujon als Singer at SF party |
 | Lucía Bosè als Guest George explains why he wants to meet Picasso (uncredited) |
| Jean Marie Ingels als Woman at Party (uncredited) |
| Doris Kleiner als Guest George explains why he wants to meet Picasso (uncredited) |
| Robert Sallin | Director |
| Ray Bradbury | Screenplay |
| Wes Herschensohn | Idea |
| Ray Bradbury | Story |
| Edwin Boyd | Screenplay |
| Michel Legrand | Original Music Composer |
| Vilmos Zsigmond | Director of Photography |
| Serge Bourguignon | Director |
| Bruce Campbell | Producer |
| Wes Herschensohn | Producer |
| Bill Cosby | Executive Producer |
| Marvin Miller | Associate Producer |
| Roy Silver | Executive Producer |
| Michel Legrand | Music |
| Vilmos Zsigmond | Cinematography |
| Jeremy Kay | Production Design |
| Damien Lanfranchi | Art Direction |
| Fernand Bernardi | Set Decoration |
| Fred Price | Set Decoration |
| Mishka Cheyko | First Assistant Director |
| Jimmy Israel | Second Assistant Director |
| Bernard Mazauric | First Assistant Director |
| Robert Biard | Sound Engineer |
| James Nelson | Supervising Sound Editor |
| Wes Herschensohn | Animation |
| Elizabeth H. Buxton | Assistant Editor |
| William Paul Dornisch | Editor |
