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Peter Falk as Geoffrey Griffin |
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Jill Clayburgh as Sarah Phoenix |
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John Lehne as George Griffin |
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Dorothy Tristan as Jean Griffin |
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Ben Hammer as Dr. Feinberg |
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George Chandler as Old Man |
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Milton Parsons as Professor |
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Irwin Charone as Dr. Thompson |
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John Harkins as Dr. Glenn |
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Randy Faustino as Randy Griffin |
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Stephen Rogers as Bob Griffin |
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Rod Haase as Usher |
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Ken Sansom as Dr. Harding |
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Sally Kirkland as Jody |
| Directing | Daryl Duke | Director |
| Editing | O. Nicholas Brown | Editor |
| Writing | John Hill | Writer |
| Sound | George Aliceson Tipton | Original Music Composer |
| Camera | Richard C. Glouner | Director of Photography |
| Costume & Make-Up | Ken Chase | Makeup Artist |
| Costume & Make-Up | Bette Iverson | Hairstylist |
| Production | Judith Craig Marlin | Associate Producer |
| Art | Lucien Hafley | Set Decoration |
| Costume & Make-Up | Dorothy Byrne | Hairstylist |
| Production | Tony Thomas | Producer |
| Production | David M. Shapiro | Associate Producer |
| Art | Bill Malley | Art Direction |
| Production | Paul Junger Witt | Executive Producer |
| Production | Joyce Selznick | Casting |
| Art | Dan Perri | Title Designer |
