Plot: With tonight's audience being from the City of Brotherly Love, Biff heads to Philly to get in training a la Rocky. For his efforts, he is given a medal by Philadelphia Mayor Edward Rendell and Sylvester Stallone's brother Frank
![Cast and Crew in Late Show With David Letterman - Season 6 - Episode 153 - Bill Cosby, Jon Favreau Poster of Cast and Crew in Late Show With David Letterman - Season 6 - Episode 153 - Bill Cosby, Jon Favreau](http://es.actoragecheck.com/lost-image.jpg)
Late Show With David Letterman - Season 6 - Bill Cosby, Jon Favreau (Episode 153)
Episode Aired On:
Friday, May 14 1999
25 years ago
Friday, May 14 1999
25 years ago