Question: This former America football halfback guest-starred in the second season of "Chuck" as which character?

Context paragraphs:
Bob Margarita: Henry Robert Margarita (November 3, 1920 – July 28, 2008) was an American football halfback and coach.  He was a two-time honorable mention All-American at Brown University, once rushing for 233 yards against Columnbia, the fourth-highest single-game rushing total in school history.  Margarita played for the Chicago Bears from 1944 to 1946, leading the team in rushing in 1945.  Following his playing career, he took the head coaching job at Georgetown University, compiling a 7–12 record in two seasons (1949–1950) and leading the Hoyas to the Sun Bowl in his first season.  After a disappointing 2–7 record in his second season, the university decided to disband the football team, citing travel expenses and high rent at Griffith Stadium.  Margarita was the last Hoya football coach until 1964, when the sport was revived at the club level.

List of Chuck episodes: "Chuck" is an American spy action-comedy-drama television series created by Josh Schwartz and Chris Fedak.  It premiered on the terrestrial television network NBC on September 24, 2007, airing on Mondays at 8:00 pm ET.  "Chuck" centers on Chuck Bartowski (played by Zachary Levi), an "average computer-whiz-next-door", who receives an encoded e-mail from an old college friend now working in the CIA; the message embeds the only remaining copy of the world's greatest spy secrets into Chuck's brain.  The first season of "Chuck" aired in 2007–08, containing 13 episodes.  After the 2007–08 Writers Guild of America strike, NBC renewed "Chuck" for a second season instead of extending the first to a full season of 22 episodes.  The full-length second season originally aired in 2008–09.  Episodes of "Chuck" are also available in various new media formats.  The first through fifth seasons are available to purchase on DVD and Blu-ray.  In the United States, United Kingdom and Canada, every episode is available for download from iTunes.  Episode titles for "Chuck" are consistently formatted as "Chuck Versus...".  For example, the pilot episode is titled "Chuck Versus the Intersect".  This list is ordered by the episodes' original air date and not by the production codes, which show the order in which episodes were filmed.  On May 13, 2011, NBC renewed "Chuck" for a fifth and final season consisting of 13 episodes.  The series concluded with a two-hour finale on January 27, 2012.

Johnny Karras: John J. Karras (January 29, 1928 – November 6, 2008) was an American football halfback who played one season with the Chicago Cardinals of the National Football League.  He was drafted by the Chicago Cardinals in the second round of the 1952 NFL Draft.  Karras played college football at the University of Illinois at Urbana–Champaign and attended Argo Community High School in Summit, Illinois.  He was a Consensus All-American in 1951.

Chuck Versus the Third Dimension: "Chuck Versus the Third Dimension" is the 12th episode of the second season of "Chuck".  It aired on February 2, 2009.  This episode was originally aired in 3-D, as the name suggests, using the same ColorCode 3-D technology as some of the commercials in Super Bowl XLIII.  When Chuck foils a plan to kill international rock star Tyler Martin (Dominic Monaghan), the agents kidnap the musician to find out who wants him dead.  Meanwhile, Big Mike's old football friend Jimmy Butterman (Jerome Bettis) comes to work at the Buy More.

Billy Hillenbrand: William Frank "Billy" Hillenbrand (March 29, 1922July 17, 1994) was an American football halfback who played professionally in the All-America Football Conference (AAFC).  He was born in Armstrong, Indiana.  He attended Indiana University where he played for the Hoosiers.  In 1942, he was a consensus All-American, having been selected as a first-team All-American halfback by the United Press, "Sporting News", Central Press Association, NEA wire service, "Collier's Weekly", "New York Sun", and Walter Camp Football Foundation.  He was drafted by the New York Giants in the 1st round (6th pick overall) in the 1944 NFL Draft.  He played three seasons in the AAFC from 1946-1948 for the Chicago Rockets and Baltimore Colts.  He played in a total of 41 NFL games.  He was a versatile player, who scored 186 points gained over 4,000 all-purpose yards in three years of professional football—1,987 receiving, 1,042 on kickoff returns, 889 rushing, and 612 on punt returns.  He also had a 48-yard interception return, a 96-yard kickoff return, and an 89-yard punt return.  In 1948, his total of 970 receiving yards, and his average of 11.2 yards per touch was the best in the AAFC, and his total of 2,067 all-purpose yards was second best in the league.

Bob Steuber: Robert James "Bob" Steuber (October 25, 1921November 29, 1996) was an American football halfback who has the distinction of having played NCAA college football after playing professional football in the NFL.  Steuber played four seasons in the National Football League (NFL) and the All-America Football Conference (AAFC).  Growing up in St. Louis, Missouri, Steuber was a standout on his high school football team.  He attended the University of Missouri, where he quickly became one of the country's most productive runners and scoring threats.  He was second in the country in 1942 with more than 1,000 yards of rushing.  Steuber was drafted by the NFL's Chicago Bears and played one game for the team, appearing as a substitute on September 26, 1943 in the Green Bay Packers' home opener, which ended in a 21-21 tie.  The next day, Steuber entered the United States Navy and was transferred to DePauw University in Greencastle, Indiana for pre-flight training.  Despite having gone from amateur status to professional football, Steuber was allowed to return to college football six days later and led DePauw to a 50-0 win over Illinois Normal College, rushing for 225 yards and scoring 25 points in the first half.  Playing for DePauw's football team in 1943, he led the nation in scoring.

Fred Gloden: Frederick Jean Gloden Jr. (born December 21, 1918) is a former American football halfback who played one season with the Philadelphia Eagles of the National Football League.  He played college football at Tulane University and attended Dubuque Senior High School in Dubuque, Iowa.  He was also a member of the Miami Seahawks of the All-America Football Conference.  Gloden served in the United States Navy during World War II.

Charles Horton: Charles "Charley" Horton is a former American football halfback who played one season with the Montreal Alouettes of the Canadian Football League (CFL).  He was drafted by the Los Angeles Rams of the National Football League (NFL) with the eleventh overall pick of the 1956 NFL Draft.  He played college football at Vanderbilt University and attended St. Petersburg High School in St. Petersburg, Florida.

Jerome Bettis: Jerome Abram Bettis Sr. (born February 16, 1972), nicknamed The Bus, is a former American football halfback who played for the Los Angeles Rams/St.  Louis Rams and Pittsburgh Steelers of the National Football League (NFL).  Bettis is sixth on the list of NFL rushing yards leaders.  He retired in 2006 after the Steelers won Super Bowl XL in his native Detroit, Michigan, beating the Seattle Seahawks.  Bettis was inducted into the Pro Football Hall of Fame in 2015.

Doc Baker: Charles "Doc" Baker was an early professional American football halfback for the Akron Indians of the "Ohio League" from 1906-1908.  He returned to the team for one last season in 1911.  He was the second-ever African American to play professional football, the first being Charles Follis.  Baker, earned his nickname, "Doc", while serving as an aide to a physician in Akron, Ohio.  He also a target of opponents trying to injure him.  Although Baker was never implicated, his football experience was marred by several gambling scandals.  According to a 1911 article the "Canton Repository", Baker was involved in just about every offensive and defensive play during a game between the Akron Indians and the Canton Professionals (who were later renamed the Canton Bulldogs in 1915) According to the "Repository" write-up; “Halfback Baker, from appearances a second Jack Johnson, was Akron’s best man.  He was in every play both on offense and defense and seemed impervious to injury.  On several occasions he was thrown hard, with several others on top of him.  But he always came up smiling.  His plunges through and outside of tackle were the best ground-gainers for the Akron team,”

Supporting paragraphs: Chuck Versus the Third Dimension Jerome Bettis
Answer: Jimmy Butterman