Dick Van Dyke as Richard Harmon

Debbie Reynolds as Barbara Harmon

Jason Robards as Nelson Downes

Jean Simmons as Nancy Downes

Van Johnson as Al Yearling

Joe Flynn as Lionel Blandsforth

Shelley Berman as David Grieff

Martin Gabel as Dr. Zenwinn

Lee Grant as Dede Murphy

Pat Collins as Herself

Tom Bosley as Farley

Emmaline Henry as Fern Blandsforth

Richard Gautier as Larry Strickland

Tim Matheson as Mark Harmon

Gary Goetzman as Jonathan Harmon

Eileen Brennan as Eunice Tase

Shelley Morrison as Jackie

Bella Bruck as Celia

John J. Anthony as Judge

Leon Alton as Bank Officer

Don Anderson as Nightclub Patron

Susan Bay Nimoy as Waitress

Doris Roberts as Hypnotic Subject

Jan Burrell as Teddy

Michael Abelar as Bartender (uncredited)

Arthur Abelson as Junior Attorney (uncredited)

Stanley Allan as Pat Collins' Assistant (uncredited)

Dick Baron as Minor Role (uncredited)

Christopher Barrey as Boy (uncredited)

Pamela Bartholomew as Model (uncredited)

Jerry Beal as Hypnotic Subject (uncredited)

Susan Benjamin as Girl (uncredited)

Ralph Brooks as Nightclub Patron (uncredited)

Joe Budd as Minor Role (uncredited)

Robert Christopher as Ralph Ames (uncredited)

Cordy Clark as Wife (uncredited)

Tom D'Andrea as Mildred's Irate Husband (voice) (uncredited)

Gino DeAgustino as Vice President (uncredited)

Fabian Dean as Husband (uncredited)

George DeNormand as Show Spectator (uncredited)

Larry Ely as Hypnotic Subject (uncredited)

Harry Fleer as Bank Guard (uncredited)

Martine Fraser as Girl (uncredited)

Tony Fraser as Benji (uncredited)

Patsy Garrett as Phoebe (uncredited)

Bill Giorgio as Counterman (uncredited)

Robert Gmuer as Pat Collins' Assistant (uncredited)

Toni Gmuer as Hypnotic Subject (uncredited)

George Golden as Show Spectator (uncredited)

Doris Goodman as Hypnotic Subject (uncredited)

Margie Hall as Bank Clerk (uncredited)

Kenneth Harp as Nancy's Date (uncredited)

Matt Helreich as Hypnotic Subject (uncredited)

Craig Huxley as Bruce (uncredited)

Harvey Johnson as Gloating Driver (uncredited)

Sallie Jones as Secretary (uncredited)

Byron Kane as Husband (uncredited)

Barbara Kelley as Clerk (uncredited)

Lucille Meredith as Lucy (uncredited)

Oaky Miller as Bank Teller (uncredited)

Hans Moebus as Show Spectator (uncredited)

Ricki Norton as Harriet (uncredited)

Monty O'Grady as Show Spectator (uncredited)

Angel Pine as Cynthia (uncredited)

Charles Pinney as Howard Thresham (uncredited)

Remo Pisani as Husband (uncredited)

Joe Ploski as Nightclub Patron (uncredited)

Cosmo Sardo as Maitre d' (uncredited)

Jackie Searl as Husband (uncredited)

Carol Anne Seflinger as Maggie (uncredited)

Bernard Sell as Nightclub Patron (uncredited)

Sammy Shack as Spectator (uncredited)

Peter Sparrow as Boy (uncredited)

Doris Stephens as Girl (uncredited)

Suzanne Taylor as Feltman (uncredited)

Dodie Warren as Ruth Thresham (uncredited)

Dick Winslow as Card Player (uncredited)