Bing Crosby

Harvey Howard

Fabian

Gil Sparrow

Tuesday Weld

Joy Elder

Nicole Maurey

Prof. Helene Gauthier

Richard Beymer

Bob Bannerman

Patrick Adiarte

T.J. Padmanagham

Yvonne Craig

Randy 'Scoop' Pruitt

Gavin MacLeod

Professor Thayer

Jimmy Boyd

Robert Higgson

Kenneth MacKenna

President Byrne of Pinehurst

Nina Shipman

Laura Howard

Angus Duncan

Harvey Howard Jr.

Carla Borelli

Harvey Jr.'s Date at Ball (uncredited)

Dick Crockett

Bones McKinney (uncredited)

Douglass Dumbrille

Judge Carter (uncredited)

Don Gazzaniga

Bit Role (Uncredited)

Byron Kane

Professor (Uncredited)

Jimmie Horan

Minor Role (Uncredited)

James Lanphier

Burdick, Maitre D' at Harvey Howard's (uncredited)

Jeffrey Sayre

Helps Harvey from Floor at Dance (uncredited)