Question: The Eagle's Brood starred which film actor who also played the role of Hopalong Cassidy?

Context paragraphs:
William Boyd (actor): William Lawrence Boyd (June 5, 1895 – September 12, 1972) was an American film actor known for portraying the cowboy hero Hopalong Cassidy.

Callaway Went Thataway: Callaway Went Thataway is a 1951 American comedy film starring Fred MacMurray, Dorothy McGuire, and Howard Keel.  It was written, directed, and produced by Melvin Frank and Norman Panama.  Also known as The Star Said No, it was a satire of the television program "Hopalong Cassidy".

Dick Jones (actor): Richard Percy Jones (February 25, 1927 – July 7, 2014), known as Dick Jones or Dickie Jones, was an American actor and singer who achieved success as a child performer and as a young adult, especially in B-Westerns.  In 1938, he played Artimer "Artie" Peters, nephew of Buck Peters, in the Hopalong Cassidy film, "The Frontiersman".  He may be best known as the voice of Pinocchio in the 1940 second Walt Disney film of the same name.

Taron Egerton: Taron David Egerton (born 10 November 1989) is a Welsh actor.  He is known for his roles in the British television series "The Smoke" and the 2014 action comedy film "".  He has also played Edward Brittain in the 2014 drama film "Testament of Youth", appeared in the 2015 crime thriller film "Legend", starred as Eddie "The Eagle" Edwards in the 2016 biographical film "Eddie the Eagle", voiced Johnny in the 2016 animated musical film "Sing", and reprised his role in the 2017 sequel "".  His upcoming films include "Billionaire Boys Club" and "Robin Hood".

Hoppy Serves a Writ: Hoppy Serves a Writ is a 1943 Western film directed by George Archainbaud and starring William Boyd as Hopalong Cassidy.  The supporting cast features Andy Clyde, Victor Jory and George Reeves.  The film remains noteworthy today as one of the earliest performances (his 3rd) of unshaven newcomer Robert Mitchum, who made an impression upon the studio by generating a surprising fan mail response exactly as Clark Gable had after playing an extremely similar unshaven role in "The Painted Desert", a Western starring William Boyd produced a dozen years earlier.

Robert Mitchum filmography: Robert Mitchum was an American actor who was in over 110 films and TV series over the course of his career.  He is ranked as #23 on the American Film Institute's list of the 50 greatest American screen legends of all time.  His first credited named role was as Quinn in the 1943 film "Border Patrol".  That same year he appeared in the films "Follow the Band", "Beyond the Last Frontier", "Cry 'Havoc'" and "Gung Ho! " as well as several Hopalong Cassidy films including "Colt Comrades", "Bar 20", "False Colors", and "Riders of the Deadline".  In 1944, he starred in the western film "Nevada" as Jim Lacy aka Nevada and a year later in the film "West of the Pecos" as Pecos Smith.  During the 1940s, he also cast in the films "Undercurrent" (1946), "Crossfire" (1947), "Out of the Past" (1947) and "The Big Steal" (1949).

List of Hopalong Cassidy films: This is a chronological list of all films featuring the character Hopalong Cassidy, played by actor William Boyd.

Al Bridge: Al Bridge (February 26, 1891 – December 27, 1957) was an American character actor who played mostly small roles in over 270 films between 1931 and 1954.  Bridge's persona was an unpleasant, gravel-voiced man with an untidy moustache.  Sometimes credited as Alan Bridge, and frequently not credited onscreen at all, he appeared in many westerns, especially in the Hopalong Cassidy series, where he played crooked sheriffs and henchmen.

Hop-Along Cassidy: Hop-Along Cassidy is a 1935 American western film, featuring the character "Hop-Along Cassidy" created by writer Clarence E. Mulford.  This is the first of 66 "Hopalong Cassidy" films produced between 1935 and 1948 and all starring William Boyd in the title role.  William Boyd was originally offered the role of Buck Peters, the ranch foreman, but decided to take the role of Hop-Along instead.

The Eagle's Brood: The Eagle's Brood is a 1935 American Western film directed by Howard Bretherton and written by Doris Schroeder and Harrison Jacobs.  The film stars William Boyd, James Ellison, William Farnum, George "Gabby" Hayes, Addison Richards, Nana Martinez and Frank Shannon.  The film was released on October 25, 1935, by Paramount Pictures.

Supporting paragraphs: The Eagle's Brood William Boyd (actor)
Answer: William Lawrence Boyd