Jill Clayburgh as Dr. Katherine "Kate" Gunzinger

Michael Douglas as Ben Lewin

Charles Grodin as Homer

Beverly Garland as Emma

Steven Hill as Jacob Gunzinger

Teresa Baxter as Maryanne

Joan Copeland as Rita

John Gabriel as Hunter

Charles Kimbrough as Jerome

Roger Robinson as Flicker

Jennifer Salt as Maisie

Daniel Stern as Cooperman

Dianne Wiest as Gail

Ron Frazier as Professor

Edwin McDonough as Professor

Toshi Toda as Professor

Robert Ackerman as Good Will Man

Raf Mauro as Jerry Lanz Man

Michael Alaimo as Man at Restaurant

Ernie Lively as Man at Restaurant (as Ernie Brown)

Noah Hathaway as Homer's Son

Marlyn Gates as Homer's Daughter

Raymond Singer as Rabbi

David Goodman as Man in Baseball Stands

James Desmond as Man in Baseball Stands

Steven Fromewick as Man in Baseball Stands

Joe Hamer as Man in Baseball Stands

Paul Blair as Self

Héctor López as Self

Joe Collins as Self

Frank McCormick as Self

Larry Doby as Self

Tony Ferrara as Self

Sal Maglie as Self

Bob Feller as Self

Mickey Mantle as Self

Roger Maris as Self

Whitey Ford as Self

Willard Marshall as Self

Al Forman as Self

Frank Messer as Self

Tom Gorman as Self

Johnny Orsino as Self

Bud Harrelson as Self

Dusty Rhodes as Self

Gene Hermanski as Self

Specs Shea as Self

Elston Howard as Self

Ron Tellefsen as Self

Monte Irvin as Self

Bobby Thomson as Self

Ed Kranepool as Self

Bill White as Self

John Kuchs as Self

Sal Yvars as Self

James Gammon as Connie Foxworth (uncredited)

Nora Heflin as Maisie (uncredited)

Lou Mulford as Woman at Restaurant (uncredited)

Daniel J. Travanti as Interviewer (uncredited)

Robert P. Fields as Young Baseball Fan (uncredited)