George C. Scott as Gloves Malloy / Spats Baxter

Trish Van Devere as Betsy McGuire / Isobel Stuart

Red Buttons as Peanuts / Jinks Murphy

Eli Wallach as Vince Marlow / Pop

Harry Hamlin as Joey Popchik ("Dynamite Hands")

Ann Reinking as Troubles Moran ("Dynamite Hands")

Jocelyn Brando as Mama Popchik / Mrs. Updike

Michael Kidd as "Pop" Popchik ("Dynamite Hands")

Kathleen Beller as Angie Popchik ("Dynamite Hands")

Barry Bostwick as Johnny Danko / Dick Cummings

Art Carney as Dr. Blaine / Dr. Bowers

Barbara Harris as Trixie Lane ("Baxter's Beauties of 1933")

Rebecca York as Kitty ("Baxter's Beauties of 1933")

George P. Wilbur as Tony Norton ("Dynamite Hands")

Clay Hodges as Sailor Lawson ("Dynamite Hands")

Charles Lane as Judge / Mr. Pennington

Peter Stader as Barney Keegle ("Dynamite Hands")

Jimmy Lennon Sr. as The Announcer ("Dynamite Hands")

Dick Winslow as Reporter / Tinkle Johnson

Brendan Dillon as Jury Foreman ("Dynamite Hands")

John Hudkins as Hood #1 / Mover #2

Bob Herron as Hood #2 / Mover #1

Denver Mattson as Sparring Partner ("Dynamite Hands")

Jimmy Nickerson as Freddie Fox ("Dynamite Hands")

Harvey Parry as Referee #1 ("Dynamite Hands")

Wally Rose as Referee #2 ("Dynamite Hands")

Fred Scheiwiller as Keegle's Manager ("Dynamite Hands")

James J. Casino as Keegle's Second ("Dynamite Hands")

John McKee as Timekeeper ("Dynamite Hands")

Gary Stokes as Timekeeper ("Dynamite Hands")

Garth Thompson as Irish Goldberg ("Dynamite Hands")

Clifford Happy as K.O. Brown ("Dynamite Hands")

Terry L. Nichols as Kid Gale ("Dynamite Hands")

Larry Hayden as Fighter #4 ("Dynamite Hands")

Patrick Omeirs as Fighter #5 ("Dynamite Hands")

Michael Rodgers as Tiger Barnes ("Dynamite Hands")

Tom Morga as Killer Wales ("Dynamite Hands")

Clarence Beatty as Zito Prima ("Dynamite Hands")

Charlie Murray as Fan #1 ("Dynamite Hands")

Evelyn Moriarty as Fan #2 ("Dynamite Hands")

June McCall as Fan #3 ("Dynamite Hands")

Jack Slate as Fan #4 ("Dynamite Hands")

Michael Lansing as Fan #5 ("Dynamite Hands")

Chuck Hicks as Hood #3 ("Dynamite Hands")

George Fisher as Hood #4 ("Dynamite Hands")

Maidie Norman as Gussie ("Baxter's Beauties of 1933")

Barney Martin as Motorcycle Cop ("Baxter's Beauties of 1933")

Sebastian Brook as Fritz ("Baxter's Beauties of 1933")

Jerry von Hoeltke as .Theater Workman ("Baxter's Beauties of 1933")

Paula Jones as Chorus Girl ("Baxter's Beauties of 1933")

John Henry as Chorus Boy ("Baxter's Beauties of 1933")

George Burns as Himself (uncredited)

Stanley Donen as Nightclub Emcee / Cab Driver (uncredited)

Peter Eastman as Jury Member ("Dynamite Hands") (uncredited)