Bruce Lee as Billy Lo

Gig Young as Jim Marshall

Dean Jagger as Dr. Land

Hugh O'Brian as Steiner

Colleen Camp as Ann Morris

Robert Wall as Carl Miller

Mel Novak as Stick

Kareem Abdul-Jabbar as Hakim

Chuck Norris as Colt

Dan Inosanto as Pasqual

Billy McGill as John

Sammo Hung Kam-Bo as Lo Chen

Roy Chiao as Henry Lo

Kim Tae-Jeong as Billy Lo

James Tien Chun as Charlie Wang

Bolo Yeung Sze as

Yuen Biao as Billy Lo

Jim James as Surgeon

Austin Wai Tin-Chi as

Wang Ho as Lau Yea-chun (archive footage)

Stephen Chang as Ming Tao (uncredited)

Warwick Paul Evans as Ringside Commentator (uncredited)

Lam Ching-Ying as Macau Fighter (uncredited)

Mars as Macau Fighter (uncredited)

Robert Clouse as Carl's Second #1 (uncredited)

Yuen Wah as Lo Chen's Second (uncredited)

Nora Miao as (archive footage) (uncredited)

Lau Kar-Wing as (uncredited)

Paul Chung Fat as (uncredited)

Betty Ting Pei as (uncredited)

André E. Morgan as (uncredited)