Question: Invincible is based on the story of the player who played two seasons with which WFL team?

Context paragraphs:
Ken Lee (linebacker): Kenneth Alan Lee (born September 3, 1948) is a former American football linebacker who played two seasons in the National Football League (NFL) for the Detroit Lions and Buffalo Bills, one season for in the Canadian Football League (CFL) with the Toronto Argonauts, and two final seasons for the Southern California Sun of the World Football League (WFL).  He played college football at the University of Washington and was drafted in the second round of the 1971 NFL Draft.

Cecil Leonard: Cecil Leonard (born July 20, 1946) is a former American football defensive back who played two seasons with the New York Jets of the American Football League (AFL) and National Football League (NFL).  He was drafted by the Jets in the eighth round of the 1969 NFL Draft.  He played college football at Tuskegee University and attended East Highland High School in Sylacauga, Alabama.  Leonard was also a member of the Birmingham Americans of the World Football League (WFL).

Mirko Castillo: Mirko Castillo (born August 30, 1962 in Lima, Peru) was a Peruvian soccer forward who spent his entire professional career in the United States.  He played two seasons in the American Soccer League, tying Ricardo Alonso as the 1990 league leading scorer.  He then played two seasons in the American Professional Soccer League and over a dozen years playing in five indoor leagues.

Vince Papale: Vincent Papale (born February 9, 1946 in Chester, Pennsylvania) is a former professional American football player.  He played three seasons with the Philadelphia Eagles of the National Football League following two seasons with the Philadelphia Bell of the World Football League.  Papale was the inspiration for the 2006 movie "Invincible".

Invincible (2006 film): Invincible is a 2006 American sports drama film directed by Ericson Core.  It is based on the true story of Vince Papale (Mark Wahlberg), who played for the Philadelphia Eagles from 1976 to 1978 with the help of his coach, Dick Vermeil (Greg Kinnear).  The film was released in the United States on August 25, 2006.

Larry Butler (Canadian football): Larry Butler (born July 10, 1952) is a former professional American football and Canadian football offensive lineman who played two season in the World Football League (WFL)for the 1974 New York Stars and 1975 Charlotte Hornets and six seasons in the Canadian Football League (CFL) for the Hamilton Tiger-Cats and the Winnipeg Blue Bombers.  Butler attended Science Hill High School in Johnson City, Tennessee where he is a member of the Science Hill Sports Hall of Fame.  He played college football at Appalachian State University where he was elected to the Athletics Hall of Fame in 1997.  He won the CFL's Most Outstanding Offensive Lineman Award in 1981.

Tom Johnson (gridiron football): Tom Johnson (born August 30, 1984) is an American football defensive tackle for the Minnesota Vikings of the National Football League (NFL).  He attended Moss Point High School, where he played as a defensive tackle for two seasons.  He played college football at Southern Miss but before that he played for two seasons of junior college football at Mississippi Gulf Coast Community College (MGCCC) in Perkinston, MS.  Following his college career, Johnson went undrafted in the 2005 NFL Draft.  He was signed by the Indianapolis Colts as an undrafted free agent.  He spent the 2007 season with the Cologne Centurions of the NFL Europe and came back with the Colts for training camp in 2008.  After being released, he turned to the Arena Football League (AFL), where he played the 2008 season with the Grand Rapids Rampage and the Philadelphia Soul.  Johnson then headed north to play in the Canadian Football League (CFL), where he played two seasons for the Calgary Stampeders and was named CFL West Division All-Star in 2010.  At the end of the 2010 CFL season, Johnson drew interest from several NFL teams, and decided to sign with the New Orleans Saints, where he played from 2011-13.  In 2014, he became a free agent and joined the Minnesota Vikings on a one-year deal, and after exceeding expectations in his first season, he was re-signed to a three-year deal in 2015.

Mike Walsh (ice hockey, born 1962): Michael Walsh (born April 3, 1962) is an American former professional ice hockey player who played in the National Hockey League (NHL).  After four seasons playing for Colgate University's men's ice hockey team, Walsh spent the first two seasons of his professional career with Malmö IF in Sweden.  Towards the end of the 1985–86 season he returned to North America, playing in two games for the Springfield Indians of the American Hockey League (AHL).  Walsh signed a contract in the off-season with Springfield's parent team, the New York Islanders, and played the next four seasons with the organization.  He played in 14 games over parts of two NHL seasons with the Islanders.  After the 1989–90 season, during which he was a member of Springfield's Calder Cup winning team, Walsh played a season in Italy for SG Cortina.  He played two more seasons in the AHL before retiring after the 1992–93 season.  Following his playing career Walsh became a head coach, coaching at the Tilton School and currently Proctor Academy.

Jim Salsbury: Jim Salsbury (August 8, 1932 – March 29, 2002) was a guard in the National Football League.  He was drafted in the second round of the 1955 NFL Draft and played two seasons with the team.  Later he played two seasons with the Green Bay Packers.

Ollie Smith (American football): Ollie Smith (born March 8, 1949 in Jackson, Mississippi) is an American former wide receiver in the National Football League.  He was drafted in the fourth round of the 1973 NFL Draft by the Baltimore Colts and played two seasons with the team.  After a year away from the NFL, he played two seasons with the Green Bay Packers.

Supporting paragraphs: Invincible (2006 film) Vince Papale
Answer: Philadelphia Bell