| Actor | Charles Bronson (as Scott Wardman), Orson Bean (as Hal Wardman), Michael Craig (as Daddy), Paul Ford (as Mr. Waldman), Jack Hawkins (as Judge), Trevor Howard (as Grandfather), Lionel Jeffries (as Soliciter), Robert Morley (as Judge), Tony Arpino (as New York Judge), Erik Chitty (as Lawyer's Elderly Client), Barney Martin (as Doorman), Leslie Schofield (as Police Sergeant), Jack Somack (as New York Landlord) |
| Actress | Honor Blackman (as Mummy), Kay Medford (as Mr. Waldman), Susan George (as Twinky), Peggy Aitchison (as Mrs. Finchley), Judith Furse (as Miss-trees), Sue Lloyd (as Ursula), Ann Way (as School Miss-tress), Mel Churcher, Jill Ireland (as Girl in Airport), Elspeth March (as Secretary) |
| Director | Richard Donner |
| Music | John Scott |
| Producer | Norman Thaddeus Vane |
| Writer | Norman Thaddeus Vane |
| Writer (Novel) | Norman Thaddeus Vane |