Which actor played Will's father, Lou Smith, in season 4?

Ben Vereen played Will’s biological father, Lou Smith, in season 4 of The Fresh Prince of Bel-Air.

Vereen appeared in the season 4 episode “Papa’s Got a Brand New Excuse,” which centers on Lou’s sudden return to Will’s life. Lou had abandoned Will and his mother years earlier, so his reappearance creates a painful conflict between Will’s hope for a relationship and the family’s distrust of Lou’s motives.

The episode is remembered as one of the show’s most dramatic stories. Will initially wants to believe that Lou has changed and even considers traveling with him, but Lou ultimately leaves again. The emotional climax features Uncle Phil comforting Will, reinforcing the father-son bond that has developed between them.

Vereen was an established Broadway and television performer before appearing on the sitcom. The role is sometimes confused with other prominent guest stars from season 4, including John Witherspoon and Robert Guillaume, but neither played Lou Smith. Vereen’s performance made Lou central to one of the series’ best-known emotional episodes.